PRO SUB_CONVERT_SHOT_AK19, RAWDATA, SHOT, CO_GAIN, X_GAIN, POL, ICATH
	;converts rawdata from logamp to photocathode current
	;uses gains from SUB_READ_AUX_AK19
	Vlog = FLTARR(2000)
	Vlin = FLTARR(2000)

IF POL EQ 'CO' or pol eq 'co' THEN begin
  Vlog = 0.002193*float(rawdata[shot,0:1999]) - 0.5331
  Vlog = -Vlog
	Vlin = 10^((Vlog-0.48705)/0.12674)
	Icath = Vlin / (50.0*CO_GAIN)  ;A		photocathode current
ENDIF

IF POL EQ 'X' or pol eq 'x' THEN begin
  Vlog = 0.002193*float(rawdata[shot,2000:3999]) - 0.5331
  Vlog = -Vlog
  Vlin = 10^((Vlog-0.48823)/0.12685)
  Icath = Vlin / (50.0*X_GAIN)  ;A   photocathode current
ENDIF
RETURN
END