PROCECURE: pmplot PURPOSE: Used for making log y-axis plots. Preformats data for use with "mplot". Plots negative data in red and positive data in green. KEYWORDS: DATA: A structure that contains the elements 'x', 'y' ['dy']. This is an alternative way of inputing the data (used by "TPLOT"). LIMITS: Structure containing any combination of the following elements: ALL PLOT/OPLOT keywords (ie. PSYM,SYMSIZE,LINESTYLE,COLOR,etc.) ALL PMPLOT keywords NSUMS: array of NSUM keywords. LINESTYLES: array of linestyles. LABELS: array of text labels. LABPOS: array of positions for LABELS. LABFLAG: integer, flag that controls label positioning. -1: labels placed in reverse order. 0: No labels. 1: labels spaced equally. 2: labels placed according to data. 3: labels placed according to LABPOS. BINS: flag array specifying which channels to plot. OVERPLOT: If non-zero then data is plotted over last plot. NOXLAB: if non-zero then xlabel tick marks are supressed. COLORS: array of colors used for each curve. NOCOLOR: do not use color when creating plot. NOTES: The values of all the keywords can also be put in the limits structure or in the data structure using the full keyword as the tag name. The structure value will overide the keyword value. LAST MODIFIED: @(#)pmplot.pro 1.4 02/04/17