total surface density (in M$_\odot$ pc$^{-2}$) of a uniform thin sheet at the mid plane $z=0$. In both cases, the total [[mass]{}]{} $m_0$ is assumed to be distributed over an [[extent]{}]{} $x_0$ as a power law with [[index]{}]{} $\alpha$, i.e. $m(x) = m_0 (x/x_0)^\alpha$. All numbers are interpreted as linear, unless the keyword [[\_log]{}]{} is specified.

The following is an example of a typical input script used in the preparation of this work:

    # -----------------------------------------------
    #  Cloudy input file for hydrostatic equilibrium
    #                Yago Ascasibar (UAM, Fall 2009)
    # -----------------------------------------------
    #
    c -----------------------------------------------
    title - Hydrostatic equilibrium -
    c -----------------------------------------------
    c Incident continuum
    c -----------------------------------------------
    # CMB
    # table ism
    # extinguish column = 21 leak = 0
    table read "attenuated_ism.dat"
    nuF(nu) = -2.0453234 at 7.541e-05 Ryd
    c -----------------------------------------------
    c Density and chemical composition
    c -----------------------------------------------
    hden 1 linear
    abundances ism
    c -----------------------------------------------
    c Gravity
    c -----------------------------------------------
    constant pressure
    gravity plane-parallel
    gravity external Sigma = 43.680, z0 = 520, a = 1
    gravity external Sigma =-39.312, z0 = 520, a = 2
    gravity external Sigma = 13.104, z0 = 520, a = 3
    c -----------------------------------------------
    c Non-thermal components
    c -----------------------------------------------
    cosmic ray background
    magnetic field -5.3
    c -----------------------------------------------
    c Stopping 