PROCEDURE: swe_a2_snap PURPOSE: Plots PAD snapshots 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. If housekeeping data exist (almost always the case), then they are displayed as text in a small separate window. USAGE: swe_a2_snap INPUTS: KEYWORDS: LAYOUT: A named variable to specify window layouts. 0 --> Default. No fixed window positions. 1 --> Macbook Air with Dell 1920x1200 external screen. 2 --> HP Z220 with twin Dell 1920x1200 screens. This puts up snapshot windows in convenient, non-overlapping locations, depending on display hardware. MODEL: Plot a model of the PAD data product with the test pulser on in a separate window. (An analytic approximation to the test pulser signal is used. See 'swe_testpulser_model.pro' for details.) DDD: Calculate a pseudo-PAD data product from the nearest 3D spectrum, and plot in a separate window. Better when A0 and A2 have the same energy grouping and time sampling. Best when A0 and A2 are at max rate with no energy grouping. There is always the limitation that 3D spectra average adjacent anode bins at the highest upward and downward deflections (80 solid angle bins instead of 96), whereas PAD spectra do not. ENORM: Normalize PAD at each energy step. KEEPWINS: If set, then don't close the snapshot window(s) on exit. ZRANGE: Sets color scale range. Default = [1,3000]. ZLOG: Sets log color scaling. Default = 1. ARCHIVE: If set, show shapshots of archive data (A3). Pseudo-PAD data is calculated from 3D archive data (A1). CREATED BY: David L. Mitchell 07-24-12 FILE: swe_a2_snap.pro VERSION: 1.0 LAST MODIFICATION: 07/24/12