Chandra X-Ray Observatory
Last modified: 28 June 2018

How do I change the MEM option when I get this error?

# DMCOPY (CIAO): WARNING: Creating large image: 134 MB. Current max set at 50 MB.
  Increase maximum using [opt mem=n] or increase blocking to reduce size.

The output files are completely valid; the warning is just there to let you know that the files that are being created are large.

To avoid the warning, specify MEM=135 by adding [opt mem=135] to the input filename; e.g. for dmcopy:

unix% dmcopy "acis_evt2.fits[ccd_id=1][bin sky=1][opt mem=135]" ccd1_bin1.fits

Be aware that the DM tools may ask for a lot of RAM when making large images, so keep your machine's capabilities in mind when using this option; see ahelp dmopt for more information.

Last modified: 28 June 2018
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