Tables with energy-/position- and pattern-dependent quantum efficiencies; CCD number s encoded in the table name; pattern number is encoded in column name (QE_0, QE_1, etc.); position information is given in column REGION

**Keywords to describe the contents of the CCF:**

**The CCF contains the following tables:**

:`QE_CCDn`- The quantum efficiency (QE) of the MOS detectors is given, per CCD, in
the extensions QE_CCDn (where n=1 (central CCD) to 7). It is described as
a function of event pattern type in columns QE_nn (where nn=0, single pixel events, - 31).
The energy grid for these arrays in given in the extension EBINS.
These extensions also hold keywords to describe the ratio of the
events which have patterns 13-25 to those which have larger pattern
numbers (available as MISCDATA). Keywords are also present which allow the average size of
the large patterns to be calculated as a function of photon energy.
**Attributes:**-
`LRG_1325`:- Ratio of large events to Pattern 13-25 events
`LRG_SIZ0`:- Coefficient 0 for calculation of average large pattern size
`LRG_SIZ1`:- Coefficient 1
`LRG_SIZ2`:- Coefficient 2
`LRG_SIZ3`:- Coefficient 3
`LRG_SIZ4`:- Coefficient 4

**Columns:**-
`REGION`:- A spatial region to allow intra-chip QE to be expressed.
`QE_nn`:- The QE per pattern.

`EBINS`:- The energy grid for the QE_CCDn arrays.
**Attributes:**- None.
**Columns:**-
`ENERGY`:- Photon energy (eV).

`QE_TOTAL`:- The total QE as a function of energy.
**Attributes:**- None.
**Columns:**-
`QE_TOTAL`:- Total QE.

`FRACTION_CHANNEL`- The fraction of the total QE which is contained in single,
double, triple or quadruple pixel events, as a function of the channels
tabulated in CHBINS_FRACTION.
**Attributes:**- None.
**Columns:**-
`MODE_ID`:- The observing modes
`THRESH`:- The threshold at which events are cut-off in channels.
`REGION`:- A spatial selection
`FRAC_S`:- The fraction contained in single pixels
`FRAC_D`:- The fraction contained in double-pixel events
`FRAC_T`:- The fraction contained in triples
`FRAC_Q`:- The fraction contained in quadruple-pixel events
`FRAC_SD`:- The fraction contained in single+double pixel events
`FRAC_SDTQ`:- The fraction contained in single+double+triple+quads

`FRACTION_ENERGY`- The fraction of the total QE which is contained in single,
double, triple or quadruple pixel events, as a function of the energies
tabulated in EBINS_FRACTION.
The effective area file generator, arfgen, calculates the detector QE by multiplying QE_TOTAL by FRACTION_ENERGY.

**Attributes:**- None.
**Columns:**-
`MODE_ID`:- The observing modes
`THRESH`:- The threshold at which events are cut-off in channels.
`REGION`:- A spatial selection
`FRAC_S`:- The fraction contained in single pixels in energy space
`FRAC_D`:- The fraction contained in double-pixel events
`FRAC_T`:- The fraction contained in triples
`FRAC_Q`:- The fraction contained in quadruple-pixel events
`FRAC_SD`:- The fraction contained in single+double pixel events
`FRAC_SDTQ`:- The fraction contained in single+double+triple+quads

`EBINS_FRACTION`- The energy grid for the FRACTION_ENERGY arrays.
**Attributes:**- None.
**Columns:**-
`ENERGY`:- Photon energy (eV).

`CHBINS_FRACTION`- The channel grid for the FRACTION_CHANNEL arrays.
**Attributes:**- None.
**Columns:**-
`PI_CHAN`:- PI channel number (channels).