Table A.1: Full capabilities of the PDR model codes participating in the Leiden comparison study.
   \rotatebox{90}{\bf Cloudy} \rotatebox{90}{\bf COSTAR} \rotatebox{90}{\bf Meudon} \rotatebox{90}{\bf UCL\_PDR} \rotatebox{90}{\bf HTBKW} \rotatebox{90}{\bf KOSMA-$\tau$ } \rotatebox{90}{\bf Aikawa} \rotatebox{90}{\bf Leiden} \rotatebox{90}{\bf Lee96mod} \rotatebox{90}{\bf Sternberg} \rotatebox{90}{\bf Meijerink}
GEOMETRY
spherical x         x          
plane-parallel, finite x   x   x     x      
plane-parallel, semi-infinite x   x x x   x x x x x
circumstellar disc x x           x      
ensemble of clouds           x          
DENSITY
homogeneous x x x x x x x x x x x
density-law x x x x   x x x x x  
time dependent x     x              
velocity field x         x          
v = const x         x          
v= v(r,...) x                    
RADIATION
isotropic radiation field     x     x          
uni-directional radiation field x x x x x   x x x x x
combination of isotropic+illuminating star     x                
Habing field x     x x     x     x
Draine field x x x   x x   x   x  
optional star x   x         x      
detailed SED x   x                
other x           x x x    
external radiation source x x x x x x x x x x x
internal radiation source                      
CHEMISTRY
stationary chemistry x x x   x x   x   x x
time-dependent chemistry x     x     x   x    
advection flow x                    
UMIST95 x   x x   x   x   x x
UMIST99 x     x x x       x x
NSM     x       x   x    
other database x x x     x   x   x  
fixed number of species x x   x x   x   x x  
variable number of species     x     x   x     x
number of species 96 48   128 46   577   419 78  
PAH's included x   x   x x   x     x
freeze-out on grains included x x x x     x        
H2 formation on grains x x x x x x x x x x x
formation of other molecules on grains     x x     x        
desorption mechanisms included   x x       x        
thermal desorption x x         x        
photoevaporation     x                
CR spot heating x   x       x        
grain-grain collisions     x                
metallicity included x x x x x x   x   x x
ISOTOPOMERS
13C x   x     x   x     x
17O                      
18O     x     x   x      
D x   x       x x      
THERMAL BALANCE
fixed temperature x x x x   x   x x x x
temperature determined from energy balance x x x x x x x x   x x
COOLING
gas-grain cooling x x x x x x x x   x x
radiative recombination x   x     x       x  
chemical balance     x                
[OI] lines x x x x x x x x   x x
12CO rotational lines x x x x x x x x     x
13CO rotational lines x   x     x x       x
[CII] line x x x x x x x x   x x
[CI] lines x x x x x x x x   x x
[SiII] lines x   x   x x       x x
OH rotational lines     x   x x       x x
H2O rotational lines     x   x x       x x
H2 rotational lines x   x x           x x
HD rotational lines x   x                
[OI] 6300$\AA$ metastable lines x x x x       x   x x
CH rotational lines   x               x  
Ly $\alpha$ metastable lines x x   x       x     x
Fe(24$\mu $,34$\mu $), [FeII](26$\mu $,35.4$\mu $) x       x         x x
H2 (rot-vib) x   x   x         x x
HEATING
H2 vibrational deexcitation x x x x x x x x   x x
single line approx. x x   x x   x x     x
only n-levels, but no J           x       x  
full rot-vib treatment x   x             x  
H2 dissociation x x x x x x x x   x x
H2 formation x x x x x x   x   x x
CR heating x x x x x x x x   x x
PE heating x x x x x x x x   x x
XR heating x     x x           x
PAH heating x   x x x x   x     x
photoionization x x x x       x     x
carbon ionization heating x x x x       x   x x
other species (Si, etc.) x   x                
gas-grain collisions x x x x       x   x x
turbulence heating x   x x              
chemical balance     x x       x      
UV TRANSFER
solved self-consistently x x x x x x   x   x x
simple exponential attenuation x x x x x x x x x x x
bi-exponential attenuation   x               x  
full RT in lines     x         x      
DUST
treatment of rad. transfer x   x   x x   x   x x
grain size distribution x   x x   x          
extinction/scattering law x x x x x x x x x x  
albedo x   x x       x     x
scattering law x   x         x      
H2 SHIELDING
shielding factors x x     x   x   x x x
single line x     x             x
detailed solution x   x     x   x      
CO SHIELDING
shielding factors x x   x x x x x x x x
single line x             x     x
detailed solution     x         x      
isotope selective photodissociation     x     x   x     x
UV PROFILE FUNCTION
Gaussian       x x            
Voigt x   x         x   x x
Box                      
other                      
RADIATIVE TRANSFER IN COOLING LINES
escape probability x x x x x x x x   x x
other                      
IR pumping x x     x     x     x
OBSERVATIONAL LINES
self-consistent treatment with cooling x     x              
escape probability x     x   x x x   x x
other     x     x          
H2 x   x         x   x  
HD     x         x   x  
12CO x   x x x x x       x
13CO x   x     x         x
C18O     x     x          
13C18O     x     x          
[OI] x   x x x x x x   x x
[CII] x   x x x x x x   x x
[CI] x   x x x x x x   x x
Si+ x   x   x           x
CS     x               x
H2O         x            
H218O                      
HCO+     x   x x         x
OH         x            
[SiI] x       x x          
[SI],[SII] x       x x         x
[FeI], [FeII] x       x           x
COMPUTED LINE PROPERTIES
resolved line profile     x   x x   x      
continuum rad./rad transfer in UV x   x                
line center intensities x   x     x   x      
line integrated intensities x   x x x x   x     x
optical depths x   x x x x   x     x
Gaussian line profile x   x   x x   x     x
box line profile                      
turbulence included x   x     x         x
COLLISIONS
H-H x       x         x  
H2-H x   x x x     x   x x
H2 - H+ x   x             x  
H2 - e x   x   x         x  
H2 - H2 x   x   x     x   x x
CO-H x x x x x     x     x
CO-H2 x x x x x x   x     x
CO-e x x   x   x         x
CO - He     x x             x
C-H x x x x x x   x   x x
C-H2 x x x x x x   x     x
C-e x   x x             x
C - He x   x x              
C - H2O                      
C+ - H x x x x x     x     x
C+ - H2 x x x x x x   x     x
C+ - e x x   x x x   x     x
O - H x x x x x x   x   x x
O - H2 x x x x x x   x   x x
O - H+ x   x x       x      
O - e x x x x x            
O - He x   x x              
OH - H                      
OH - He                      
OH - H2         x x          
H- - H x                    
H2O - e                      
H2O - H                     x
H2O - H2         x           x
H2O - O                      
dust - H/H2 x       x            
dust-any x                    
Si+ - H x   x     x          
HD - H     x                
HD - H2     x                
PAH-any x       x            
OUTPUT
abundance profile over (AV/depth) x x x x x x x x x x x
column density over (AV/depth) x x x x   x       x x
temperature profile over (AV/depth) x x x x x x x x   x x
emitted intensities x   x x x x   x   x x
opacities at line center     x   x x   x   x x
heating and cooling rates over (AV/depth) x   x x   x   x   x x
chemical rates over (AV/depth)     x x   x   x   x x
excitation diagram of H2 x   x         x   x  

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