SXT_PREP can perform a wide variety of the standard processing required to use SXT data. The User's Guide has a description of the capabilities and some of the fundamentals, and it should be read before reading this section.
The input specifying which images to process can be either an index and
data, or it can be the filenames infil and dataset numbers dset_arr.
Some sample calling sequences are:
IDL> sxt_prep, input1, input2, index_out, data_out
IDL> sxt_prep, index, data, index_out, data_out
IDL> sxt_prep, infil, dset_arr, index_out, data_out, $
IDL> helio=[-9.8,-20.3], date_helio='14-JUN-92 02:37:41'
IDL> sxt_prep, index, data, index_out, data_out, /helio, ref_image=10
IDL> sxt_prep, index, data, index_out, data_out, ref_image=spr_index(0)
IDL> sxt_prep, index, data, index_out, data_out, /roll
A description of some of the keywords follows:
SXT_PREP always stores the actual pixel address of the portion extracted and used. The .HIS.SUN_CENTER value stored in the index is always the actual pixel address where the sun center fell on the CCD for that time. When a registration is performed, the CORNER_SAV value will not be set to the same value, even though it is a registered cube. This is because the registration is RELATIVE TO SUN CENTER, and that is changing. Plotting the corner minus the sun center WILL result in a flat plot with all values identical.