a | double/multiple object of comparable brightness |
b | fainter neighbours within
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c | companions of similar brightness between
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d | elongated |
e | chain of compact sources |
f | irregular |
g | crowded |
h | in group/association of more than 5 bright stars/clusters |
i | irregular background |
j | saturated star |
k | near edge of CCD |
l | star? |
m | galaxy? |