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
821
( 23)
1142
( 15)
UBV CCD
V
B-V
U-B
476
( 480)
516
( 320)
VRIc CCD
V
V-R
R-I
476
( 472)
516
( 320)
VIc CCD
V
V-I
476
( 473)
UBV pg
V
B-V
U-B
190
( 57)