CoCoA and relative time lags in 13 Seyfert-1 galaxies. The CoCoA strengths versus the relative time lags for 13 Seyfert galaxies from the AGN black hole mass database. From the time lags we know the slowest line is Hα. We use it as our reference point and plot relative time lags of Hα, Hβ and Hγ versus the ρ′(Hα) for the same lines. All galaxies in the AGN black hole mass database with time lags for Hα, Hβ and Hγ are used, with the exception for Mrk142 as this object has two different sets of time-lag measurements for Hβ with strong disagreement in between. The plotted errors are standard deviations of the mean.