functions in cosmo.i - p

              propersize(dl,z,h0=,k=,lambda0=,Omega_m=,q0=,silent=)  
 
   Compute the seperation (in kpc) of two line of sight sparated  
   by dtheta arcseconds.  
   INPUTS:  dtheta - angular separation (in ")  
                 z - redhsift values   
   EXAMPLE: plot the separation in kpc beetween two line of sight  
            separated with 2" as a function of redshift for the  
            default cosmology (Lambda = 0.7, Omega_m=0.3) up to  
            z = 5  
              
        z = span(0,5,100)  
        plg,propersize(2,z),z;  
        xytitles,"z","Proper Size (kpc)"  
     
                
interpreted function, defined at contrib/cosmo.i   line 302