Standard deviation of the fit of the ridges in each of the redshift bins. At redshifts of z < 0.021, the method does not detect any ridges due to the number of galaxies in the bins. We also see increasing irregularity in the ridges below about redshift z < 0.05. Besides this we the star-forming ridge having very high dispersion at redshifts above z < 0.15 due to being very sparse at these redshifts.
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