Strings:
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ADJUSTL(_s):  remove leading blanks & tabs, insert blanks to right
ADJUSTR(_s):  remove trailing blanks, insert blanks at front
TRIM(_s):  trim trailing blanks

Example:  create _name like "calib03" or "calib24"
   _name = "calib" // ((_ichan < 10) ? "0" : "") // TRIM(ADJUSTL(_ichan));

Arguments, variables:
--------------------
PRESENT(_var):  True if _var exists

Signals:
-------
To read:  _baseline = EXECUTE(_signame);