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You are here: Home Telescopes Irenee du Pont Instruments Website WFCCD FCCD Reduction Software (IDL) x_ydtort info

Screen shot of x_ydtorgui


  • The red line traces the slit edge and the green line indicates where the trace has too large of an error to fit.
  • The right-mouse-button (RMB) can be used to extend/truncate the region of the trace to be fit.
  • The left-mouse-button (LMB) adjusts brightness/contrast.
  • The "DELTRC" button deletes the trace altogether. Below is an example of a bad trace. These often occur next to alignment boxes.
  • Click on "NEXT" or "PREV" to cycle through the traces.

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