2. Using XAS programs


The XAS system is a collection of programs (cooperating essentially via the XAS environment which are invoked from the usual Unix shell or VMS DCL prompt.
In this respect XAS is unlike packages with an overarching monitor (like the MIDAS monitor or the IRAF cl) and also unlike monolithic programs like XSPEC.
Each XAS command can be invoked in one of the following way (please note the notation conventions used throughout this document) : It is also possible to combine a sequence of commands to make a procedure

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