The -h option prints a short summary of the usage of the procedure. The -k option instructs ASTQDP that the intermediate QDP file should be retained (the default is to delete it). If this option is selected then the file will be named .qdp. If the filename is not supplied then it will be prompted for. If the output device is not specified then QDP will use the device defined by the PGPLOT_TYPE environment variable, which is usually set to the value "/xwin".% astqdp [-h] [-k] [filename [device]]
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