To make a plot

  1. Select one or two photometric systems,
  2. Select one or two parameters,
  3. Select one or two data sources,
  4. Click on "Plot".

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SystemParametersData sources (Number of stars)
 UBV  V    B-V    U-B     1211 ( 18)
 UBV CCD  V    B-V    U-B     101 ( 142)  495 (1088)
 UBV pg  V    B-V    U-B     223 ( 480)