;+
; NAME:
;  vt3d_dfluxdtemp_slab
; PURPOSE: (one line)
;  Return (d flux / d T) associated with slab
; DESCRIPTION:
;  Return (d flux / d T) associated with slab specific heat
; CATEGORY:
;  Volatile Transport
; CALLING SEQUENCE:
;  phi_v = vt3d_dfluxdtemp_slab(freq, mass_0, specheat)
; INPUTS:
;  freq : frequency in s^-1
;  mass_0 : time-averaged slab mass, averaged over the volatiles. g cm^-2
;  specheat : specific heat, averaged over the volatiles, erg g^-1 K^-1
;    specheat is defined as
;      total( specheat * mass_0 * angarea_delta ) / total( mass_0 * angarea_delta )
; OUTPUTS:
;  phi_v : d flux/d T in erg cm^-2 s^-1 K^-1
; RESTRICTIONS:
; PROCEDURE:
;  Young, L. A. 2016, Volatile transport on inhomogeneous surfaces: II. Numerical calculations (VT3D)
;   Resubmitted to Icarus.
;   Eq. 4.2-4a
; MODIFICATION HISTORY:
;  Written 2011 Apr 10, by Leslie Young, SwRI
;  2011-11-05 LAY slightly changed documentation
;  2016 Jul 3 LAY. Modified for inclusion in vt3d library.
;-

function vt3d_dfluxdtemp_slab, freq, mass_0, specheat

    return, freq * mass_0 * specheat
end