Table 3: U and B magnitudes of RX J0720.4-3125 (1$\sigma $ errors).
Epoch U B
February-April 1997   26.58 $\pm$ 0.25
January 1999   26.79 $\pm$ 0.20
January 2000 25.68 $\pm$ 0.17 26.44 $\pm$ 0.15
December 2000   26.787 $\pm$ 0.040
Dec. 2002-Jan. 2003   26.620 $\pm$ 0.050


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