Table 2: Comparison of BV photometry ``CCD-Source''.
Source n $\Delta V$ $\Delta (B-V)$

Hogg (1960)

 24 $-0.025\pm 0.07$ $+0.016\pm 0.03$
Lyngå (1960) 24 $+0.040\pm 0.06$ $-0.011\pm 0.03$
Perry & Hill (1969) 21 $+0.013\pm 0.05$ $+0.012\pm 0.04$
Forbes et al. (1998) 19 $+0.038\pm 0.06$  $\cdots$ 
Eggen (1972) 11 $+0.050\pm 0.06$ $-0.010\pm 0.02$
Stauffer et al. (1989) 5 $+0.058\pm 0.05$ $+0.046\pm 0.04$
Rollestone & Byrne (1997) 4 $+0.027\pm 0.02$ $+0.14\pm 0.03$

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