Procedure : tsy_valid_coords Purpose: Helper function used by Tsygenanko wrapper routines - checks coordinate system in dlimits structure Input: dlimits: dlimits structure from the tplot position variable Keywords: geopack_2008: specify to use the 2008 version of Geopack library. Must have v9.2 or later of the IDL Geopack DLM Output: Returns -1 on failure, +1 on success $LastChangedBy: egrimes $ $LastChangedDate: 2014-03-18 09:51:27 -0700 (Tue, 18 Mar 2014) $ $LastChangedRevision: 14573 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/external/IDL_GEOPACK/tsy_valid_coords.pro $