The focus in this module is at present on calculations of distances in
  a given cosmology. The parameters for the cosmological model are set 
  using the variables OMEGA_M0, OMEGA_L0, OMEGA_R0, H0 in the module 
  namespace (see below for details).
    | float | 
        
          | dl(z) Calculates the luminosity distance in Mpc at redshift z.
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    | float | 
        
          | da(z) Calculates the angular diameter distance in Mpc at redshift z.
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    | float | 
        
          | dm(z) Calculates the transverse comoving distance (proper motion distance) 
      in Mpc at redshift z.
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    | float | 
        
          | dc(z) Calculates the line of sight comoving distance in Mpc at redshift z.
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    | float | 
        
          | dVcdz(z) Calculates the line of sight comoving volume element per steradian 
      dV/dz at redshift z.
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    | float | 
        
          | dl2z(distanceMpc) Calculates the redshift z corresponding to the luminosity distance 
      given in Mpc.
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    | float | 
        
          | dc2z(distanceMpc) Calculates the redshift z corresponding to the comoving distance 
      given in Mpc.
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    | float | 
        
          | t0() Calculates the age of the universe in Gyr at z=0 for the current set 
      of cosmological parameters.
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    | float | 
        
          | tl(z) Calculates the lookback time in Gyr to redshift z for the current set
      of cosmological parameters.
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    | float | 
        
          | tz(z) Calculates the age of the universe at redshift z for the current set 
      of cosmological parameters.
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    | float | 
        
          | tl2z(tlGyr) Calculates the redshift z corresponding to lookback time tlGyr given 
      in Gyr.
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    | float | 
        
          | tz2z(tzGyr) Calculates the redshift z corresponding to age of the universe tzGyr 
      given in Gyr.
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    | float | 
        
          | absMag(appMag,
        distMpc) Calculates the absolute magnitude of an object at given luminosity 
      distance in Mpc.
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    | float | 
        
          | Ez(z) Calculates the value of E(z), which describes evolution of the Hubble
      parameter with redshift, at redshift z for the current set of 
      cosmological parameters.
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    | float | 
        
          | Ez2(z) Calculates the value of E(z)^2, which describes evolution of the 
      Hubble parameter with redshift, at redshift z for the current set of 
      cosmological parameters.
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    | float |  | 
    | float |  | 
    | float |  | 
    | float | 
        
          | DeltaVz(z) Calculates the density contrast of a virialised region ΔV(z), 
      assuming a ΛCDM-type flat cosmology.
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    | float | 
        
          | RVirialXRayCluster(kT,
        z,
        betaT) Calculates the virial radius (in Mpc) of a galaxy cluster at redshift
      z with X-ray temperature kT, assuming self-similar evolution and a 
      flat cosmology.
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