Specifically, I would like to ask you for the favor of identifying
for me (by name) three galaxies: two appear as triangles and one
as a star in your IRX-beta diagram, and they are located to the
`bottom-right' of the relation, in the sense that they have the
reddest UV colors in the region of lowest IR/UV. They are located
around IR/UV<0.1 and beta~ -1.2. I also would need to know the
names of the two galaxies (triangles) located around IR/UV~0.1/0.2
and beta~ -0.5.
I would like to check for these galaxies their H-alpha distribution
relative to the UV light, to check whether we are in the presence
of specific SFHs for these objects.

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From my discussion with Daniel on 10 Feb 2009 in D.C.:

EW(Ha) has an extinction dependence, too!:
K_FUV~4.53
K_R  ~1.48  (starburst; for stars)
K_3.6~0.09
K_Ha ~2.535 (for ionized regions; different than for stars)

See if the data at the bottom of the IRX-beta relation have a dependence with distance from IRX-beta_starburst.  If so, since they are essentially dust-free, then we know that distance depends on age.  For example, she finds that U-B (a strong age indicator and not so dependent on dust) is ~ independent of distance from IRX-beta

--I checked FUV_cor/NIR and EW(Ha) versus distance, using only galaxies with TIR/FUV<0.3.  They do indeed follow the same general trends as the entire sample, suggesting that the perpendicular distances are driven more by age than extinction.