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XMM-Newton Science Analysis System


selectlib (selectlib-4.68) [xmmsas_20040318_1831-6.0.0]

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Three-dimensional filter functions

The following functions evaluate to true if a vector lies inside or on the border of the specified three dimensional figure:

• cone(vcen, alpha, vtest)

where

$\parbox{.30\textwidth}{{\tt vcen}}$ 		 : vector defining symmetry axis of figure

$\parbox{.30\textwidth}{{\tt alpha}}$ 		 : half opening angle of cone in rad

$\parbox{.30\textwidth}{{\tt vtest}}$ 		 : vector for inclusion test

Please note: For the sake of readability and clarity it is recommended to avail these filters in conjunction with the In operator (see below).