WFPC2 Technical Instrument Report 08-03:
An Update on Creating a Yearly WFPC2 Superbias
D. Thatte and J. Biretta
The procedure for producing a yearly superbias file from one hundred and twenty of the individual bias frames is discussed in this TIR . The individual images are taken during the year as part of the WFPC2 calibration plan. The file is used to calibrate all WFPC2 observations during the following year.