3. IRAF/STSDAS Tasks Used in This Script

• readnoise = 5 (for single exposure)

• gain = 7 (or 14 in rare cases)

• 1 count ~ 7 electrons (if gain=7)
  ~ 3.6x10-18 ergs-cm2s-1 in V.

• 1 pixel = 0.04554 arcsecs (platescale at the center of the PC chip)

• 1 pixel = 0.09961 arcsecs (platescale at the center of the WF chips)

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