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
1254
( 23)
UBV CCD
V
B-V
U-B
354
( 333)
423
( 260)
VIc CCD
V
V-I
354
( 287)
423
( 255)