Same as the second panel of Fig. 3, but for different SDSS-RM quasar subsamples. Top: 31 SDSS-RM quasars with well-measured Hβ lags from Wang et al. (2020), using only 2014 observations. A clear increase in the breathing slope is seen with increasing timescale. Middle: Same SDSS-RM quasar sample as above, but using all available SDSS-RM observations. The breathing trend disappears. Bottom: All RM quasars with more than 20 spectroscopic epochs. No breathing effect is detected either across all timescales.