For historical reasons, the VRI photometry has produced several systems
which have quite similar, but the V-R and R-I indices are not exactly
in the same standard system. Therefore a datatype has been attributed to
each realisation of the VRI filter combination.
The datatype vrikpg refers to the VRI photographic photometry in the
system of Kron.
|V-R||:||V-R colour index|
|R-I||:||R-I colour index|
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Last Update: 17 February 1998