Clarification of the differential reddening in the dustatt_calzleit module.

CHANGELOG.md

@@ -6,6 +6,7 @@
 ### Fixed
 - The best fit could not be computed in photo-z mode because the redshift was negative. (Médéric Boquien)
 - The bayesian estimates could not be computed when some models were older than the age of the universe. (Médéric Boquien)
+- The usage of `dustatt\_cazleit` causes some confusion regarding the reddening of the stars and of the gas. We have clarified that they are both attenuated with the same law and switched the differential reddening to 1 by default. (Médéric Boquien & Véronique Buat)
 
 ### Optimised
 

pcigale/sed_modules/dustatt_calzleit.py

@@ -185,8 +185,10 @@ def a_vs_ebv(wavelength, bump_wave, bump_width, bump_ampl, power_slope):
 class CalzLeit(SedModule):
     """Calzetti + Leitherer attenuation module
 
-    This module computes the dust attenuation using the
-    formulae from Calzetti et al. (2000) and Leitherer et al. (2002).
+    This module computes the dust attenuation using the formulae from
+    Calzetti et al. (2000) and Leitherer et al. (2002). Note that both the
+    stars and the gas are attenuated with the same curve as opposed to Calzetti
+    et al. (2000) where the gas is attenuated with a Milky Way curve.
 
     The attenuation can be computed on the whole spectrum or on a specific
     contribution and is added to the SED as a negative contribution.
@@ -204,7 +206,7 @@ class CalzLeit(SedModule):
             "cigale_list(minvalue=0., maxvalue=1.)",
             "Reduction factor for the E(B-V)* of the old population compared "
             "to the young one (<1).",
-            0.44
+            1.0
         )),
         ("uv_bump_wavelength", (
             "cigale_list(minvalue=0.)",