Getting error information into a file

Raw data from the telescope probably don't contain a variance array. The recommended way of getting error information into a file is when the data are in its earliest stages of reduction, i.e., when de-biasing. The CCDPACK (see SUN/139) applications `makebias' and `debias' will create a variance array in the de-biased data files which Figaro can use in the remaining stages of reduction.