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
444
( 9)
UBV CCD
V
B-V
U-B
32
( 343)
74
(2498)
289
( 426)
VIc CCD
V
V-I
88
(8024)
289
( 573)
431
(4344)