Comparison of the photometry for 133 stars in common between Carter (1990) and Koornneef (1983). Error bars for individual points have been omitted for clarity. These results were used in combination with the 2MASS‐SAAO color transformations derived in § 4.8 to determine indirectly the transformations between the Koornneef (1983) homogenized photometric system and 2MASS.