  We construct a multiparametric Tully-Fisher (TF) relation for a large sample
of edge-on galaxies from the Revised Flat Galaxy Catalog using HI data from the
EDD database and parameters from the EGIS catalog. We incorporate a variety of
additional parameters including structural parameters of edge-on galaxies in
different bandpasses. Besides the rotation curve maximum, only the
HI-to-optical luminosity ratio and optical colours play a statistically
significant role in the multiparametric TF relation. We are able to decrease
the standard deviation of the multiparametric TF relation down to 0.32 mag,
which is at the level of best modern samples of galaxies used for studies of
the matter motion in the Universe via the TF-relation.
