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masque: Mask used in the cross-correlation
masque indicates which mask was used in the numerical cross-correlation.

A mask contains 'holes' corresponding to more than 3000 selected weak neutral metallic lines). Two such masks are most used, R37000F0 and R37000K0, for F0 and K0 spectral types, prepared for a slightly broadened spectral resolving power of 37000. Other (private) masks are also used, in particular one useful for A-type stars (prive4, with fewer lines) and another for M-type stars (prive1).

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