After having read the WBS data with YODAT, you can get a light curve of the
ratio of GRS-PCi to GRS-PCj with UTPLOT.
For GRS-PCL1, you do the following:
IDL> grspcl=mk_grspcl(index,data,xtime=xtime)
MK_GRSPCL is a function for making a float array of GRS-PC11
and GRS-PC12 data.
grspcl=fltarr(4,8*N), where N is the number of major frames.
It takes two major frames to assemble a full set of WBS data.
grspcl(0,*) is pc11 and grspcl(1,*) is pc12.
For example, to ratio GRS-PC12 to GRS-PC11:
IDL> utplot,xtime,grspcl(1,*)/grspcl(0,*),index(0)
For GRS-PCL2, you can do a similar ratio. grspcl(2,*) is pc21 and
grspcl(3,*) is pc22.