Radial distribution of helium in the Milky Way
  We present preliminary results of the study of the radial distribution of
helium in the Milky Way. We use 37 spectra from 23 Galactic HII regions
observed with VLT, GTC and Magellan Telescope. Using PyNeb, we calculate the
abundance of He$^+$ with all the He$\thinspace$I detected lines. In most cases,
both the average abundance of He$^+$ and its associated dispersion are higher
when triplet lines are used. Although corrections for collisional processes are
considered in the calculations, the differences in the He$^+$ abundance are not
negligible between both spin configurations. This suggests that self-absorption
processes are important in most triplet lines. Four ICFs were used to estimate
the contribution of He$^0$ in the total abundance. The resulting radial
distribution of helium has a negative slope when singlet lines are used,
regardless of the ICF used.
