Poor Person's Attempt at Tabulating Useful Numbers
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Sp Type        Te(K)    B-V     V-R
O6-O8V         38000   -0.33   -0.18
O9V            33200   -0.31   -0.17
O9.5V          31450   -0.31   -0.17
B0V            29700   -0.30   -0.16
B1V            25600   -0.28   -0.15
B2V            22300   -0.25   -0.13
B3V            19000   -0.22   -0.12
B4V            17200   -0.20   -0.10
B5V            15400   -0.18   -0.09
B6V            14100   -0.16   -0.08
B7V            13000   -0.14   -0.07
B8V            11800   -0.11   -0.05
B9V            10700   -0.09   -0.04
A0V             9480   -0.05   -0.02
A2V             8810   +0.02   +0.02
A5V             8160   +0.14   +0.09
A7V             7930   +0.19   +0.12
F0V             7020   +0.38   +0.23
F2V             6750   +0.44   +0.26
F5V             6530   +0.50   +0.29
F7V             6240   +0.57   +0.33
G0V             5930   +0.65   +0.38
G2V             5830   +0.68   +0.40
G4V             5740   +0.70   +0.41
G6V             5620   +0.74   +0.43
K0V             5240   +0.85   +0.49
K2V             5010   +0.92   +0.53
K4V             4560   +1.07   +0.62
K5V             4340   +1.15   +0.67
K7V             4040   +1.27   +0.73
M0V             3800   +1.36   +0.79
M1V             3680   +1.41   +0.81
M2V             3530   +1.48   +0.85
M3V             3380   +1.55   +0.89
M4V             3180   +1.65   +0.95
M5V             3030   +1.73   +1.00
M6V             2850   +1.82   +1.05