Minimum heating intensity derived from the SED model using submm data compared to minimum heating intensity determined without submm data. The orange line indicates the 1:1 relation. The dashed lines define the limits Draine et al. (2007) used as boundaries for their minimum heating intensity Umin. We remind the reader that our model solutions are obtained with Umin as a free parameter. For convention on symbols, see Fig. 4. Limiting Umin to 0.7 avoids an overestimate of the dust mass but removes the possibility of low temperature radiation fields.
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