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The detector gain is a function of the gas state (density, pressure,
and temperature) and the HV.
Temporal gain variations are corrected by normalizing the event
pulse height by a correction function 
(cf. Eq. (F.7))
shown in
Fig. F.4.
This function equals unity for 
instead of 151.
It is unknown whether this is intentional.
Parameters:
] PHA channel of the Al K 
line (BAL )
(from Prescott fit)
SASS source code: package PSPC, bubble CT, subroutine CTG
SASS files: none
The cumulative effect of ADC non-linearity, gain saturation,
and temporal gain correction is shown in
Fig. F.5
as function of the measured pulse-height 
for three typical
gain values 
103, 135, 146.
With the corrections NLC, GSC, and TGC applied, the measured
pulse height of an X-ray photon should be independent of
when the photon is detected during the ROSAT mission.
Figure F.5: Cumulative effect of ADC non-linearity, gain saturation, and
temporal gain correction as a function of the measured
pulse-height 
for three typical gain values
( 
103, 135, 146).
