AO Home AO Astronomy Robert Minchin Blog Publications IDL Routines . ... The routine returns a 14-element mas structure that can be displayed using masplotall. ... b - mas structure that will contain the reduced DPS data. bpcal - input mas structure containing the bandpass calibrator to be used. baccum - mas structure that will hold the accumulation. ... Smooth a mas struct with a tophat (a.k.a. boxcar average) function, using the IDL smooth routine, or using a boxcar median or a Hann function. ...