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>> I had the paper but I thought it was meant only to Tycho-1.
Strictly speaking, yes. But the Tycho-2 construction paper
indicates they used the same calibration. Since most of the E-region
stars are bright, the scale error at the faint end of Tycho-1 was not
noticed. John Greaves has shown (and there is other formally published
stuff by others) that there is no significant scale error at the faint
end of Tycho-2---just gets noisy.
In case folks need to see Greaves' plots (BV data with the poor
Tycho-consortium correction versus the LONEOS file), they're here:
http://ftp.lowell.edu/pub/bas/VJT2mVJL.gif
http://ftp.lowell.edu/pub/bas/BVTL_VJL.gif
http://ftp.lowell.edu/pub/bas/BVT2mBVL.gif
\Brian
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