The method employed to calculate the modal value from the count versus frequency histogram is user selected using parameter TYPE.
The histogram may also be smoothed using a Normal distribution filter of integer radius SFACT. In general, values less than 3 have very little effect. A value of 0 indicates no smoothing is to be employed.
This application is intended to form the basis of a user program requiring image statistics. The user requiring other data from the application will need to modify subroutines HSUB and HISTPEA2 so that the desired parameters (say mean or median) are passed between them.
With the addition of the OUTCAT keyword, HSUB is now used by GAIA to generate backgrounds. You should not, therefore, change the keywords in the STL output.
ESP --- Extended Surface Photometry