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
( 14)
525
( 68)
VRIc data
V
V-R
R-I
155
( 68)
byHalpha
V
b-y
y-Ha
449
( 352)
RGU data
G
G-R
U-G
11
( 52)