BPROJ Caveats
- The grid transparancy is a function of position, and very large maps
do not reflect this variation.
Corollaries:
- The relative brightness of sources in a full disk map is poorly represented
- The peak flux is unreliable in full disk maps.
- Full disk maps can only be done with the coarsest subcollimators.
- Maps should never be made with the spin axis included.
- Negatives are inherent to Bproj maps.
- The source size (FWHM) in a Bproj map is never smaller than the
angular resolution of the finest collimator used in the map.
- Blocky pixel structure in a 1-collimator map indicates undersampling.
- Collimators with angular resolution < source size contibute only noise.
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Ed Schmahl
Last modified: Tue Apr 9 12:46:51 EDT 2002