XSLP_TRACEMASK
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     Description
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     Mask of variable or row names that are to be traced through the SLP iterates
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     Type
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     String
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     Default value
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     none: no tracing
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     Notes
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     If the mask is nonempty, variables and rows matching the mask are listed after each SLP iteration and each cascade, allowing for a convinient means to observe how certain variables change through the iterates. This feasture is provided for tuning and model debugging purposes. The actual information printed is controlled by
     XSLP_TRACEMASKOPS.
      The string in the tracmask may contain several variable or row names, separated by a whitespace. Wildcards may also be used. | 
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     Affects routines
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     See also
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