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: http://www.mrao.cam.ac.uk/~bn204/blog/2008/12/out-of-focus-holography-with-mm-wave.html
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This work is being documented on the following wiki:
http://wiki.gb.nrao.edu/bin/view/PTCS/OOFHolography
The oof software is available for download at:
http://www.mrao.cam.ac.uk/~bn204/oof/software.html
Finally, as an illustration, below is a map of the GBT surface
re-created from out-of-focus MUSTANG images. Although this particular
observation took of the order of 15 minutes, it is likely we will be
able to reduce this to the order of a couple of minutes, allowing
effective and rapid correction of all gravitation and thermal effects
on the telescope.