PROCEDURE: swe_cal_snap PURPOSE: Plots snapshots of calibration data in a separate window for times selected with the cursor in a tplot window. Hold down the left mouse button and slide for a movie effect. Calibration data can be extracted from 3D, PAD, or SPEC data. USAGE: swe_cal_snap INPUTS: KEYWORDS: DDD: Get calibration from 3D data. PAD: Get calibration from PAD data. SPEC: Get calibration from SPEC data. UNITS: Data units. KEEPWINS: If set, then don't close the snapshot window(s) on exit. ARCHIVE: If set, show snapshots of archive data. $LastChangedBy: dmitchell $ $LastChangedDate: 2014-10-31 14:15:03 -0700 (Fri, 31 Oct 2014) $ $LastChangedRevision: 16106 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/maven/swea/swe_cal_snap.pro $ CREATED BY: David L. Mitchell 07-24-12