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 vrik refers to the VRI photoelectric photometry in the
system of Kron.
The BV colours are stored with the ubv data.
|V-R||:||V-R colour index|
|R-I||:||R-I colour index|
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Last Update: 17 February 1998