Top: clumpiness vs i-band total magnitude (imag) for our initial sample of 96 starburst and 145 main sequence galaxies (with red filled circles and blue empty squares, respectively). The median clumpiness values and errors (gray squares with black error bars) are derived for six bins of imag. Our selection cut (imag < 22.5) is highlighted with a vertical gray line. Bottom: clumpiness vs elongation for the same sample as above, with median clumpiness and errors estimated in seven bins of elongation. The vertical gray line indicates our cut for the final selection (elongation < 3.5), even though we remember that one additional nearly edge-on MS galaxy was also removed by visual inspection.
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