  In this paper we present the results of a new kaonic helium-4 measurement
with a 1.37 g/l gaseous target by the SIDDHARTA-2 experiment at the DA{\Phi}NE
collider. We measured, for the first time, the energies and yields of three
transitions belonging to the Mseries. Moreover, we improved by a factor about
three, the statistical precision of the 2p level energy shift and width induced
by the strong interaction, obtaining the most precise measurement for gaseous
kaonic helium, and measured the yield of the L{\alpha} transition at the
employed density, providing a new experimental input to investigate the density
dependence of kaonic atoms transitions yield.
