  In the manuscript, the properties of the proposed intermediate BLR are
checked for the mapped AGN PG 0052+251. With the considerations of the apparent
effects of the broad He {\sc ii} line on the observed broad H$\beta$ profile,
the line parameters (especially the line width and the line flux) of the
observed broad H$\alpha$ and the broad H$\beta$ are carefully determined. Based
on the measured line parameters, the model with two broad components applied
for each observed broad balmer line is preferred, and then confirmed by the
calculated much different time lags for the inner/intermediate broad components
and the corresponding virial BH masses ratio determined by the properties of
the inner and the intermediate broad components. Then, the correlation between
the broad line width and the broad line flux is checked for the two broad
components: one clearly strong negative correlation for the inner broad
component, but one positive correlation for the intermediate broad component.
The different correlations for the two broad components strongly support the
intermediate BLR of PG0052+251.
