Vladimir,
Look in the Online Help for the PLOT keyword(s) X/Y/ZSTYLE. Setting this keyword to the value of 1 "forces the exact axis range". Thus, the command:
PLOT, findgen(438), XSTYLE=1
would force the X Axis to end at value 437. (Because we did not explicitly set YSTYLE, the Y Axis would still range to 500 on the display, but you could set that, too, if you want.)
James Jones
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