PROCEDURE: load_po_pwi PURPOSE: Loads Polar Plasma Wave Instrument key parameter data into "tplot" variables. INPUTS: none, but will call "timespan" if time range is not already set. KEYWORDS: DATA: Raw data can be returned through this named variable. TIME_RANGE: 2 element vector specifying the time range SEE ALSO: "make_cdf_index","loadcdf","loadcdfstr","loadallcdf" CREATED BY: Davin Larson FILE: load_po_pwi.pro LAST MODIFICATION: 99/05/27