Fig. 2.
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Ion-neutral damping rate 
of Alfvén waves in the CNM (left-hand panel) and DiM (right-hand panel) as a function of CR energy E. Different colors are used for different values of the C+ abundance. The parameters adopted for the CNM and DiM are given in Table 1. The shaded regions represent the range without propagating Alfvén waves (see Sect. 2.1).
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