PROCEDURE: thm_load_esa_cal PURPOSE: Loads ESA time varying relative efficiency into common tha_esa_cal for use by get_thm_esa_cal() INPUT: KEYWORDS: file: string, strarr the complete path and filename to the raw pkt files if not set, uses timerange to select files themishome: string path to data dir, where data dir contains the th* dir, where *=a,b,c,d,e CREATED BY: J. McFadden VERSION: 1 LAST MODIFICATION: 07/10/19 MOD HISTORY: NOTES: