resummation model (BFKL+CDS) when applied to one of our fits for the model BFKL+CD with exponential initial condition. For comparison we plot also the spectra obtained from the unintegrated gluon density with more involved evolution and fitted to HERA data (KS-HERA), see the main text for more details. \[fig:sudeffect\]](bfklcds_exp_pTc "fig:"){width="48.00000%"} ![An effect of the Sudakov resummation model (BFKL+CDS) when applied to one of our fits for the model BFKL+CD with exponential initial condition. For comparison we plot also the spectra obtained from the unintegrated gluon density with more involved evolution and fitted to HERA data (KS-HERA), see the main text for more details. \[fig:sudeffect\]](bfklcds_exp_pTf "fig:"){width="48.00000%"}

The obtained UGDs are plotted in one-dimensional plots in Fig. \[fig:gluons\] as a function of $x$ and $k_T$. Note, that in order to better reflect the difference between UGDs we plot $k_T^2\, \mathcal{F}(x,k_T)$. We show results of all the models of Table \[tab:params\], hence also those with rather high $\chi^2$ value (see Table \[tab:chi2\]). All the UGDs with the DGLAP contribution are comparable, which shows that the evolution scenario is more important than a particular shape of the initial parametrization. On the other hand, the differences between UGDs are more pronounced than those in the 