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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