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Aql X-1:

Only standard magnitudes are plotted.
Each colour represents a different observing configuration (site, telescope, instrument, binning).
Only lightcurve data points for the following filters (LCO names) are plotted, using the symbols indicated:
U = hexagon
B = thin diamond
V = plus
R = up-pointing triangle
I = square
Y = left-pointing triangle
up = pentagon
gp = cross
rp = down-pointing triangle
ip = circle
zs = diamond
SDSS-Y = right-pointing triangle
SDSS-Z = horizontal line

See also here.