The fringe envelope in a single channel (or pixel/column) is rather wide due
to the narrow bandwidth. Below we show the interferometric signal of channel I1
of pixel 50 over several scanning periods.
The plots were created with the following commands:
f = midigui() ; Select fringe track file
spawn, getenv('vltiCbin')+'/oir1dCompressData "'+f+'" '+getenv('prismhmask')+' outf'
df = oirgetdata('outf')
!p.multi = [0,1,2]
plot,df.data1(50),/ynozero,xrange=[2000,2200]
plot,df.localopd(0)*1e6,xrange=[2000,2200],ytitle='OPD [microns]'