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From: jjung11@alaska.edu
Subject: About the amount of particle background
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2 replies: 1 2
4 followups: 1 2 3 4

Private message: yes  no

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Notification:


Date: Sat, 22 Jun 2019 06:40:18 +0200
From: jjung11@alaska.edu
To: xmmhelp@sciops.esa.int
Subject: About the amount of particle background
Full_Name: Jaewoong Jung
Submission from: (NULL) (193.147.152.102)


Dear XMM helpdesk team,

Hi
I'm doing the X-ray background study. (for the magnetosheath emission)
After cutting out the astrophysical sources using 'region' and 'evselect'
commands,
I calculated particle background (instrumental background) following the
document 
https://www.cosmos.esa.int/web/xmm-newton/sas-thread-background
I referred to the 'HOW TO USE THE FWC EVENT FILES FOR SPECTRA GENERATION' part
of the link. I also applied region/evselect to FWC event list.
So I got two spectrum, from original event and from evqpb file, then I put both
in the Xspec (with rmf/arf), and compared rates in the energy domain I'm
interested (0.5-0.7 keV)
I did this for like 10 events, and for the most events, FWC spectrum has count
30~50% of the original spectrum. However, from the previous studies, particle
background does not seem so big.

Can you give me some advice why I'm getting so big values for the particle
background?

Thanks,
Jaewoong


Reply 1

Resend
From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: jjung11@alaska.edu
Subject: Re: About the amount of particle background (PR#85386)
Date: Mon Jun 24 14:20:30 2019
Dear Jaewoong Jung,

Could you send me the log of the task evqpb ? Also, could you tell me which FWC

data are you using from the repository ? 

Thanks,

Ignacio de la Calle
XMM-Newton SOC


> Submission from: (NULL) (193.147.152.102)
> 
> 
> Dear XMM helpdesk team,
> 
> Hi
> I'm doing the X-ray background study. (for the magnetosheath emission)
> After cutting out the astrophysical sources using 'region' and 'evselect'
> commands,
> I calculated particle background (instrumental background) following the
> document 
> https://www.cosmos.esa.int/web/xmm-newton/sas-thread-background
> I referred to the 'HOW TO USE THE FWC EVENT FILES FOR SPECTRA GENERATION'
part
> of the link. I also applied region/evselect to FWC event list.
> So I got two spectrum, from original event and from evqpb file, then I put
both
> in the Xspec (with rmf/arf), and compared rates in the energy domain I'm
> interested (0.5-0.7 keV)
> I did this for like 10 events, and for the most events, FWC spectrum has
count
> 30~50% of the original spectrum. However, from the previous studies,
particle
> background does not seem so big.
> 
> Can you give me some advice why I'm getting so big values for the particle
> background?
> 
> Thanks,
> Jaewoong
> 
> 


Followup 1

Compose reply
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From: Jaewoong Jung <jjung11@alaska.edu>
Date: Mon, 1 Jul 2019 16:28:55 -0800
Subject: Re: About the amount of particle background (PR#85386)
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
--0000000000002167ab058ca7d510
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Dear Ignacio,

Sorry for late reply. I was not able to access my research PC.

The log of the task evqpb is as following:

(base) dyn-137-229-27-249:test jjung11$ evqpb
table=1566_0554500101_EMOS1_S004_ImagingEvts.ds exposurefactor=2.0
attfile=1566_0554500101_AttHk.ds outset=evqpb_m1.fits

evqpb:- Executing (routine): evqpb
table=1566_0554500101_EMOS1_S004_ImagingEvts.ds exposurefactor=2
attfile=1566_0554500101_AttHk.ds outset=evqpb_m1.fits calctlmax=no
overwritesubmode=no  -w 1 -V 4

evqpb:- evqpb (evqpb-0.5)  [xmmsas_20180620_1732-17.0.0] started:
2019-07-01T23:41:37.000

evqpb:- Exposure submode: PrimeFullWindow

evqpb:- Input Revolution 1566 startTime 2008-06-28T09:53:19.000stopTime
2008-06-28T17:21:41.000

evqpb:- Retrieving LIVETI01 Exposure time... 53043.1

evqpb:- Retrieving LIVETI02 Exposure time... 53090.8

evqpb:- Retrieving LIVETI03 Exposure time... 53113.2

evqpb:- Retrieving LIVETI04 Exposure time... 53028.1

evqpb:- Retrieving LIVETI05 Exposure time... 53038.9

evqpb:- LIVETI06 Not found

evqpb:- Retrieving LIVETI07 Exposure time... 52992.1

evqpb:- REV found  1569 index 378 lastElement 385

evqpb:- Rev. Number: 1569 ccd 1 current accum exposure 11351.9

evqpb:- Rev. Number: 1569 ccd 2 current accum exposure 11362

evqpb:- Rev. Number: 1569 ccd 3 current accum exposure 11367.1

evqpb:- Rev. Number: 1569 ccd 4 current accum exposure 11348.4

evqpb:- Rev. Number: 1569 ccd 5 current accum exposure 11350.3

evqpb:- Rev. Number: 1569 ccd 7 current accum exposure 11342.8

evqpb:- REV found  1549 index 371 lastElement 378

evqpb:- Rev. Number: 1549 ccd 1 current accum exposure 40220

evqpb:- Rev. Number: 1549 ccd 2 current accum exposure 40278.8

evqpb:- Rev. Number: 1549 ccd 3 current accum exposure 40273.1

evqpb:- Rev. Number: 1549 ccd 4 current accum exposure 40233.6

evqpb:- Rev. Number: 1549 ccd 5 current accum exposure 40252.9

evqpb:- Rev. Number: 1549 ccd 7 current accum exposure 40221.6

evqpb:- REV found  1548 index 364 lastElement 371

evqpb:- Rev. Number: 1548 ccd 1 current accum exposure 59459.5

evqpb:- Rev. Number: 1548 ccd 2 current accum exposure 59539.5

evqpb:- Rev. Number: 1548 ccd 3 current accum exposure 59542.1

evqpb:- Rev. Number: 1548 ccd 4 current accum exposure 59466.3

evqpb:- Rev. Number: 1548 ccd 5 current accum exposure 59494.3

evqpb:- Rev. Number: 1548 ccd 7 current accum exposure 59441.6

evqpb:- CCD 1 EXPOSURE 26521.6 TARGET 53043.1 TOTAL EXP 59459.5 Weight
Factor 0.446044

evqpb:- CCD 2 EXPOSURE 26545.4 TARGET 53090.8 TOTAL EXP 59539.5 Weight
Factor 0.445846

evqpb:- CCD 3 EXPOSURE 26556.6 TARGET 53113.2 TOTAL EXP 59542.1 Weight
Factor 0.446014

evqpb:- CCD 4 EXPOSURE 26514 TARGET 53028.1 TOTAL EXP 59466.3 Weight Factor
0.445866

evqpb:- CCD 5 EXPOSURE 26519.5 TARGET 53038.9 TOTAL EXP 59494.3 Weight
Factor 0.445748

evqpb:- CCD 7 EXPOSURE 26496 TARGET 52992.1 TOTAL EXP 59441.6 Weight Factor
0.445749

evqpb:- Deleting 399560 rows

evqpb:- New table size 197277

evqpb:- Creating timestamp for ccd 1

evqpb:- Creating timestamp for ccd 2

evqpb:- Creating timestamp for ccd 3

evqpb:- Creating timestamp for ccd 4

evqpb:- Creating timestamp for ccd 5

evqpb:- EXPOSU06 extension not found

evqpb:- Creating timestamp for ccd 7

evqpb:- Sorting time column...  Done.

evqpb:- running attcalc

evqpb:- Running attcalc to fix X,Y coordinates

evqpb:- Executing (routine): attcalc eventset=evqpb_m1.fits fixedra=0
fixeddec=0 fixedposangle=0 attitudelabel=ahf nominalra=0 nominaldec=0
setpnttouser=no refpointlabel=pnt atthkset=1566_0554500101_AttHk.ds
withatthkset=yes withmedianpnt=yes calctlmax=no imagesize=0.36  -w 1 -V 4

evqpb:- attcalc (attcalc-4.39)  [xmmsas_20180620_1732-17.0.0] started:
2019-07-01T23:41:46.000

evqpb:- attcalc (attcalc-4.39)  [xmmsas_20180620_1732-17.0.0] ended:
2019-07-01T23:41:47.000

evqpb:- evqpb (evqpb-0.5)  [xmmsas_20180620_1732-17.0.0] ended:
2019-07-01T23:41:47.000


I'm not sure what your second question means. I thought that the point of
evqpb is that user doesn't need to find FWC file by himself.


I also attached the full log of how I got rates of original/FWC spectrum.
It was just following the manual that I also attached. You may see the
commands I used. (I did up to bullet point 22) Basically I extracted
spectrum from original event file (after soft proton flaring & removing
point sources) and also from the event file from FWC. And my concern here
is that the FWC rates seems higher than expected (like in the previous
literature)


Thanks,

Jaewoong

On Mon, Jun 24, 2019 at 4:20 AM Ignacio de la Calle
<xmmhelp@sciops.esa.int>
wrote:

> Dear Jaewoong Jung,
>
> Could you send me the log of the task evqpb ? Also, could you tell me
> which FWC
>
> data are you using from the repository ?
>
> Thanks,
>
> Ignacio de la Calle
&g

Message of length 1497710 truncated


Followup 2

Compose reply
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From: Jaewoong Jung <jjung11@alaska.edu>
Date: Mon, 1 Jul 2019 18:29:20 -0800
Subject: Re: About the amount of particle background (PR#85386)
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
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I'm also attaching the counts vs energy plot of the spectrum.
This looks similar to the example plot in
https://www.cosmos.esa.int/web/xmm-newton/sas-thread-background (Fig.3)
so I think I did it correctly...

Best,
Jaewoong

On Mon, Jul 1, 2019 at 4:28 PM Jaewoong Jung <jjung11@alaska.edu> wrote:

> Dear Ignacio,
>
> Sorry for late reply. I was not able to access my research PC.
>
> The log of the task evqpb is as following:
>
> (base) dyn-137-229-27-249:test jjung11$ evqpb
> table=1566_0554500101_EMOS1_S004_ImagingEvts.ds exposurefactor=2.0
> attfile=1566_0554500101_AttHk.ds outset=evqpb_m1.fits
>
> evqpb:- Executing (routine): evqpb
> table=1566_0554500101_EMOS1_S004_ImagingEvts.ds exposurefactor=2
> attfile=1566_0554500101_AttHk.ds outset=evqpb_m1.fits calctlmax=no
> overwritesubmode=no  -w 1 -V 4
>
> evqpb:- evqpb (evqpb-0.5)  [xmmsas_20180620_1732-17.0.0] started:
> 2019-07-01T23:41:37.000
>
> evqpb:- Exposure submode: PrimeFullWindow
>
> evqpb:- Input Revolution 1566 startTime 2008-06-28T09:53:19.000stopTime
> 2008-06-28T17:21:41.000
>
> evqpb:- Retrieving LIVETI01 Exposure time... 53043.1
>
> evqpb:- Retrieving LIVETI02 Exposure time... 53090.8
>
> evqpb:- Retrieving LIVETI03 Exposure time... 53113.2
>
> evqpb:- Retrieving LIVETI04 Exposure time... 53028.1
>
> evqpb:- Retrieving LIVETI05 Exposure time... 53038.9
>
> evqpb:- LIVETI06 Not found
>
> evqpb:- Retrieving LIVETI07 Exposure time... 52992.1
>
> evqpb:- REV found  1569 index 378 lastElement 385
>
> evqpb:- Rev. Number: 1569 ccd 1 current accum exposure 11351.9
>
> evqpb:- Rev. Number: 1569 ccd 2 current accum exposure 11362
>
> evqpb:- Rev. Number: 1569 ccd 3 current accum exposure 11367.1
>
> evqpb:- Rev. Number: 1569 ccd 4 current accum exposure 11348.4
>
> evqpb:- Rev. Number: 1569 ccd 5 current accum exposure 11350.3
>
> evqpb:- Rev. Number: 1569 ccd 7 current accum exposure 11342.8
>
> evqpb:- REV found  1549 index 371 lastElement 378
>
> evqpb:- Rev. Number: 1549 ccd 1 current accum exposure 40220
>
> evqpb:- Rev. Number: 1549 ccd 2 current accum exposure 40278.8
>
> evqpb:- Rev. Number: 1549 ccd 3 current accum exposure 40273.1
>
> evqpb:- Rev. Number: 1549 ccd 4 current accum exposure 40233.6
>
> evqpb:- Rev. Number: 1549 ccd 5 current accum exposure 40252.9
>
> evqpb:- Rev. Number: 1549 ccd 7 current accum exposure 40221.6
>
> evqpb:- REV found  1548 index 364 lastElement 371
>
> evqpb:- Rev. Number: 1548 ccd 1 current accum exposure 59459.5
>
> evqpb:- Rev. Number: 1548 ccd 2 current accum exposure 59539.5
>
> evqpb:- Rev. Number: 1548 ccd 3 current accum exposure 59542.1
>
> evqpb:- Rev. Number: 1548 ccd 4 current accum exposure 59466.3
>
> evqpb:- Rev. Number: 1548 ccd 5 current accum exposure 59494.3
>
> evqpb:- Rev. Number: 1548 ccd 7 current accum exposure 59441.6
>
> evqpb:- CCD 1 EXPOSURE 26521.6 TARGET 53043.1 TOTAL EXP 59459.5 Weight
> Factor 0.446044
>
> evqpb:- CCD 2 EXPOSURE 26545.4 TARGET 53090.8 TOTAL EXP 59539.5 Weight
> Factor 0.445846
>
> evqpb:- CCD 3 EXPOSURE 26556.6 TARGET 53113.2 TOTAL EXP 59542.1 Weight
> Factor 0.446014
>
> evqpb:- CCD 4 EXPOSURE 26514 TARGET 53028.1 TOTAL EXP 59466.3 Weight
> Factor 0.445866
>
> evqpb:- CCD 5 EXPOSURE 26519.5 TARGET 53038.9 TOTAL EXP 59494.3 Weight
> Factor 0.445748
>
> evqpb:- CCD 7 EXPOSURE 26496 TARGET 52992.1 TOTAL EXP 59441.6 Weight
> Factor 0.445749
>
> evqpb:- Deleting 399560 rows
>
> evqpb:- New table size 197277
>
> evqpb:- Creating timestamp for ccd 1
>
> evqpb:- Creating timestamp for ccd 2
>
> evqpb:- Creating timestamp for ccd 3
>
> evqpb:- Creating timestamp for ccd 4
>
> evqpb:- Creating timestamp for ccd 5
>
> evqpb:- EXPOSU06 extension not found
>
> evqpb:- Creating timestamp for ccd 7
>
> evqpb:- Sorting time column...  Done.
>
> evqpb:- running attcalc
>
> evqpb:- Running attcalc to fix X,Y coordinates
>
> evqpb:- Executing (routine): attcalc eventset=evqpb_m1.fits fixedra=0
> fixeddec=0 fixedposangle=0 attitudelabel=ahf nominalra=0 nominaldec=0
> setpnttouser=no refpointlabel=pnt atthkset=1566_0554500101_AttHk.ds
> withatthkset=yes withmedianpnt=yes calctlmax=no imagesize=0.36  -w 1 -V 4
>
> evqpb:- attcalc (attcalc-4.39)  [xmmsas_20180620_1732-17.0.0] started:
> 2019-07-01T23:41:46.000
>
> evqpb:- attcalc (attcalc-4.39)  [xmmsas_20180620_1732-17.0.0] ended:
> 2019-07-01T23:41:47.000
>
> evqpb:- evqpb (evqpb-0.5)  [xmmsas_20180620_1732-17.0.0] ended:
> 2019-07-01T23:41:47.000

Message of length 159769 truncated


Followup 3

Compose reply
Download message
From: Jaewoong Jung <jjung11@alaska.edu>
Date: Mon, 1 Jul 2019 18:32:44 -0800
Subject: Re: About the amount of particle background (PR#85386)
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
--000000000000f64894058ca98f28
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Sorry that was a wrong plot (that was for 0.5-0.7 keV, which I'm
interested)
Plot for the total energy range is following

On Mon, Jul 1, 2019 at 6:29 PM Jaewoong Jung <jjung11@alaska.edu> wrote:

> I'm also attaching the counts vs energy plot of the spectrum.
> This looks similar to the example plot in
> https://www.cosmos.esa.int/web/xmm-newton/sas-thread-background (Fig.3)
> so I think I did it correctly...
>
> Best,
> Jaewoong
>
> On Mon, Jul 1, 2019 at 4:28 PM Jaewoong Jung <jjung11@alaska.edu>
wrote:
>
>> Dear Ignacio,
>>
>> Sorry for late reply. I was not able to access my research PC.
>>
>> The log of the task evqpb is as following:
>>
>> (base) dyn-137-229-27-249:test jjung11$ evqpb
>> table=1566_0554500101_EMOS1_S004_ImagingEvts.ds exposurefactor=2.0
>> attfile=1566_0554500101_AttHk.ds outset=evqpb_m1.fits
>>
>> evqpb:- Executing (routine): evqpb
>> table=1566_0554500101_EMOS1_S004_ImagingEvts.ds exposurefactor=2
>> attfile=1566_0554500101_AttHk.ds outset=evqpb_m1.fits calctlmax=no
>> overwritesubmode=no  -w 1 -V 4
>>
>> evqpb:- evqpb (evqpb-0.5)  [xmmsas_20180620_1732-17.0.0] started:
>> 2019-07-01T23:41:37.000
>>
>> evqpb:- Exposure submode: PrimeFullWindow
>>
>> evqpb:- Input Revolution 1566 startTime 2008-06-28T09:53:19.000stopTime
>> 2008-06-28T17:21:41.000
>>
>> evqpb:- Retrieving LIVETI01 Exposure time... 53043.1
>>
>> evqpb:- Retrieving LIVETI02 Exposure time... 53090.8
>>
>> evqpb:- Retrieving LIVETI03 Exposure time... 53113.2
>>
>> evqpb:- Retrieving LIVETI04 Exposure time... 53028.1
>>
>> evqpb:- Retrieving LIVETI05 Exposure time... 53038.9
>>
>> evqpb:- LIVETI06 Not found
>>
>> evqpb:- Retrieving LIVETI07 Exposure time... 52992.1
>>
>> evqpb:- REV found  1569 index 378 lastElement 385
>>
>> evqpb:- Rev. Number: 1569 ccd 1 current accum exposure 11351.9
>>
>> evqpb:- Rev. Number: 1569 ccd 2 current accum exposure 11362
>>
>> evqpb:- Rev. Number: 1569 ccd 3 current accum exposure 11367.1
>>
>> evqpb:- Rev. Number: 1569 ccd 4 current accum exposure 11348.4
>>
>> evqpb:- Rev. Number: 1569 ccd 5 current accum exposure 11350.3
>>
>> evqpb:- Rev. Number: 1569 ccd 7 current accum exposure 11342.8
>>
>> evqpb:- REV found  1549 index 371 lastElement 378
>>
>> evqpb:- Rev. Number: 1549 ccd 1 current accum exposure 40220
>>
>> evqpb:- Rev. Number: 1549 ccd 2 current accum exposure 40278.8
>>
>> evqpb:- Rev. Number: 1549 ccd 3 current accum exposure 40273.1
>>
>> evqpb:- Rev. Number: 1549 ccd 4 current accum exposure 40233.6
>>
>> evqpb:- Rev. Number: 1549 ccd 5 current accum exposure 40252.9
>>
>> evqpb:- Rev. Number: 1549 ccd 7 current accum exposure 40221.6
>>
>> evqpb:- REV found  1548 index 364 lastElement 371
>>
>> evqpb:- Rev. Number: 1548 ccd 1 current accum exposure 59459.5
>>
>> evqpb:- Rev. Number: 1548 ccd 2 current accum exposure 59539.5
>>
>> evqpb:- Rev. Number: 1548 ccd 3 current accum exposure 59542.1
>>
>> evqpb:- Rev. Number: 1548 ccd 4 current accum exposure 59466.3
>>
>> evqpb:- Rev. Number: 1548 ccd 5 current accum exposure 59494.3
>>
>> evqpb:- Rev. Number: 1548 ccd 7 current accum exposure 59441.6
>>
>> evqpb:- CCD 1 EXPOSURE 26521.6 TARGET 53043.1 TOTAL EXP 59459.5 Weight
>> Factor 0.446044
>>
>> evqpb:- CCD 2 EXPOSURE 26545.4 TARGET 53090.8 TOTAL EXP 59539.5 Weight
>> Factor 0.445846
>>
>> evqpb:- CCD 3 EXPOSURE 26556.6 TARGET 53113.2 TOTAL EXP 59542.1 Weight
>> Factor 0.446014
>>
>> evqpb:- CCD 4 EXPOSURE 26514 TARGET 53028.1 TOTAL EXP 59466.3 Weight
>> Factor 0.445866
>>
>> evqpb:- CCD 5 EXPOSURE 26519.5 TARGET 53038.9 TOTAL EXP 59494.3 Weight
>> Factor 0.445748
>>
>> evqpb:- CCD 7 EXPOSURE 26496 TARGET 52992.1 TOTAL EXP 59441.6 Weight
>> Factor 0.445749
>>
>> evqpb:- Deleting 399560 rows
>>
>> evqpb:- New table size 197277
>>
>> evqpb:- Creating timestamp for ccd 1
>>
>> evqpb:- Creating timestamp for ccd 2
>>
>> evqpb:- Creating timestamp for ccd 3
>>
>> evqpb:- Creating timestamp for ccd 4
>>
>> evqpb:- Creating timestamp for ccd 5
>>
>> evqpb:- EXPOSU06 extension not found
>>
>> evqpb:- Creating timestamp for ccd 7
>>
>> evqpb:- Sorting time column...  Done.
>&

Message of length 1988416 truncated


Reply 2

Resend
From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: jjung11@alaska.edu
Subject: Re: About the amount of particle background (PR#85386)
Date: Wed Jul 10 14:27:24 2019
Dear Jaewoong Jung,

> I did this for like 10 events, and for the most events, FWC spectrum has
count
> 30~50% of the original spectrum. However, from the previous studies,
particle
> background does not seem so big.

What comparison are you making here to say is larger ? What do you mean by 
original spectrum ? why do you expect a lower particle background ?

Regards,

Ignacio de la Calle
XMM-Newton SOC


Followup 4

Compose reply
Download message
From: Jaewoong Jung <jjung11@alaska.edu>
Date: Tue, 23 Jul 2019 15:47:02 -0800
Subject: Re: About the amount of particle background (PR#85386)
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
--000000000000d5add8058e61cfd0
Content-Type: text/plain; charset="UTF-8"

Sorry for the late reply.

I was investigating about this matter.
I think this is my problem. Thanks for helping me.

Best,
Jaewoong

On Wed, Jul 10, 2019 at 4:27 AM Ignacio de la Calle
<xmmhelp@sciops.esa.int>
wrote:

> Dear Jaewoong Jung,
>
> > I did this for like 10 events, and for the most events, FWC spectrum
has
> count
> > 30~50% of the original spectrum. However, from the previous studies,
> particle
> > background does not seem so big.
>
> What comparison are you making here to say is larger ? What do you mean by
> original spectrum ? why do you expect a lower particle background ?
>
> Regards,
>
> Ignacio de la Calle
> XMM-Newton SOC
>
> This message is intended only for the recipient(s) named above. It may
> contain proprietary information and/or
> protected content. Any unauthorised disclosure, use, retention or
> dissemination is prohibited. If you have received
> this e-mail in error, please notify the sender immediately. ESA applies
> appropriate organisational measures to protect
> personal data, in case of data privacy queries, please contact the ESA
> Data Protection Officer (dpo@esa.int).
>
>
>

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<div dir=3D"ltr">Sorry for the late
reply.<div><br></div><div>I was investi=
gating about this matter.</div><div>I think this is my problem.
Thanks for =
helping me.</div><div><br></div><div>Best,</div><div>Jaewoong</div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr"
class=3D"gmail_attr">On Wed, =
Jul 10, 2019 at 4:27 AM Ignacio de la Calle &lt;<a
href=3D"mailto:xmmhelp@s=
ciops.esa.int">xmmhelp@sciops.esa.int</a>&gt;
wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">Dear Jaewoong Jung,<br>
<br>
&gt; I did this for like 10 events, and for the most events, FWC spectrum h=
as<br>
count<br>
&gt; 30~50% of the original spectrum. However, from the previous studies, p=
article<br>
&gt; background does not seem so big.<br>
<br>
What comparison are you making here to say is larger ? What do you mean by =
<br>
original spectrum ? why do you expect a lower particle background ?<br>
<br>
Regards,<br>
<br>
Ignacio de la Calle<br>
XMM-Newton SOC<br>
<br>
This message is intended only for the recipient(s) named above. It may cont=
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