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)
Washington
T1
C-M
M-T1
T1-T2
M51
27
( 8)
UBV CCD
V
B-V
U-B
22
( 818)
152
(3180)
VIc CCD
V
V-I
152
(4055)