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Syntax

XSPEC is a command-driven, interactive program. You will see a prompt

XSPEC12>

whenever input is required. Command recall and inline editing are available using the arrow keys. XSPEC uses Tcl as its user interface, providing looping, conditionals, file I/O and so on. For further details of the Tcl syntax, consult the ``Description of Syntax'' section, appendix A, and links therein.