XMM-Newton Science Analysis System


eimsim (eimsim-2.4) [xmmsas_20190531_1155-18.0.0]

... position,

The RAs and decs are projected onto a plane tangent to the celestial sphere at the reference direction recorded in the WCS keywords CRVAL1 and CRVAL2 of the original template exposure maps. Use of such planar coordinates for $x$ and $y$ forces the $x-y-S$ space to be cartesian, in which it is straightforward to measure distances.

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