To make a plot
Select one or two photometric systems,
Select one or two parameters,
Select one or two data sources,
Click on "Plot".
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System
Parameters
Data sources (Number of stars)
UBV
V
B-V
U-B
459
( 13)
ß data
Hbeta
115
( 5)
UBV CCD
V
B-V
U-B
245
(1425)
VIc CCD
V
V-I
245
(1423)