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     371 ( 8)
 byHalpha  V    b-y    y-Ha     449 ( 225)
 UBV pg  V    B-V    U-B     52 ( 85)