Photoelectric photometry is presented for over 400 stars using the uvgr system of Thuan and Gunn. Stars were selected to cover a wide range of spectral type, luminosity class, and metallicity. A mean main sequence is derived along with reddening curves and approximate transformations to the UBVR system. The calibration of the standard-star sequence is significantly improved.
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S. Kent (1985) studied this question.