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 CCD
T1
C-M
M-T1
T1-T2
C-T1
M51
523
( 862)
BV-ASCC
V
B-V
2
( 34)