UTPLOT plots any quantity on a
time plot with hours, minutes, and seconds given a
corresponding index array by typing:
IDL> utplot, roadmap, gt_total_cnts(roadmap, 1)
IDL> utplot, index, timehist
IDL> utplot, x, y, ref_time, xrange=xrange
IDL> utplot, x, y, ref_time, timerange=[index(0), index(100)]
IDL> utplot, x, y, ref_time, timerange=['1-jun-91','5-jun-91']
IDL> utplot, x, y, ref_time
Most typical IDL plotting parameters also apply. You can overplot other
quantities (timehist2, etc.) by using OUTPLOT.