taulines.h has the following, which defines the structure/class EmLine:

typedef struct 
{
	/* all of these are set to dangerous values by EmLineJunk */
	/* type of redistribution function, */
	int iRedisFun ;
	/* pointer to line within continuum array */
	int ipCont ;
	 /* ion stage of element, 1 for atom, 2 ion, etc */
	int IonStg;
	 /* atomic number of element, 1 for H, 2 for He, etc */
	int nelem;
	/* line optical depth to continuum source through illuminated face */
	float TauCon ;
	/* inward and total line optical depths */
	float TauIn , TauTot ;
	/* inward fraction */
	float FracInwd;
	/* continuum pumping rate */
	float pump ;
	/* line intensity */
	float xIntensity ;
	/* number of photons emitted per sec in the line */
	float phots;
	/* gf value */
	float gf ;
	/* escape and destruction probs */
	float Pesc , Pdest;
	/* damping constant, and number related to it */
	float damp, damprel ;
	/* total opacity (cm^-1) in transition*/
	float dTau;
	/* cooling and heating due to collisional excitation */
	float cool , heat ;
	/* ratio of collisional to radiative excitation*/
	float ColOvTot ;
	/* collision strength for transition */
	float cs;
	/* wavelentgh, usually in A, used for printout */
	float WLAng;
	/* transition energy in degrees kelvin*/
	float EnergyK;
	/* transition energy in Rydberg */
	float EnergyRyd;
	/* transition energy in ergs */
	float EnergyErg;
	/* transition energy in wavenumbers */
	float EnergyWN;
	/* related to line opacity, needs pop and vel */
	float opacity;
	/* lower and upper statistical weights */
	float gLo , gHi ;
	/* populations of lower and upper levels, and pop that enters net opacity */
	float PopLo , PopHi , PopOpc ;
	/* transition prob, Einstein A upper to lower */
	float Aul ;
	/* ratio A21/(A21+C21) */
	float AovTot ;
	/* type of transition for Mewe collision strength*/
	/* in general first parameter for CS expansion*/
	/* this parameter zero indicates high quality line */
	float cs1;
	/* ots rate */
	float ots;
}EmLine;

==============================================================================

FeII lines, all in pop371
Fe2LevN

==============================================================================

hydrogen lines 
HydroLines[ipZ][[ipHi][ipLo][ipl]
described in hydrogen.txt
space for lines is created in HydroCreate, 
declared in taulines.h

==============================================================================

level 1 level1 
all included in taulines.h
#include "taulines.h"

for( i=0; i < NTAULINES; i++ )
	TauLines[i][0] = xxx;

definition of TauLines is in taulines.h
space created and data read in in createdata
initial setup of line array in tauout

==============================================================================
level 2 level2 

level2 lines are evaluated in DimaCool, 
	which contains logic for when to reevaluate rates

for( i=0; i<nWindLine; ++i)
	TauLine2[i][ipCompPurpose] = xxxx;

all included in taulines.h
EXTERN EmLine *TauLine2;

number of levels in taulines.h:
#define	NWINDDIM	6744

upper limit to loops is following, set to -1 when level 2 turned off
extern long	nWindLine;

data read in in getdata
initial setup of line array in tauout
collision strenghts generated in ColStrGBar, called in CoolDima
level populations determined in CoolDima, called by coolr
added to line stack in lines.c

==============================================================================

ots continuum rates, all hydro rates, evaluated in routines HydroOTS(); HeMetalOTS();,
called by ionize

all lines add ots by calling AddOTSLin, called by routines that generate cooling,
	mostly level2 and level3

all continua add ots by calling AddOTSCon

==============================================================================

radiative transfer escape and destruction probabilities are set in MakeRT

==============================================================================

excitation temperature of any transferred line obtained by calling TexcLine
Texc = TexcLine(TauLine2 )

==============================================================================

line optical depths incremented in LineTauInc, called by tauinc

line transfer parameters such as escape and pumping rates are established in 
MakeWindRT and MakeStatRT which are called by MakeRT, which can be called from various places

=========================================================================

dumping info about a line,
void DumpLine(EmLine * t)
#include "dumpline.h"