/*he1col evaluate collisional rates for helium singlets */
void he1col(void);

/*he1gma evaluate photoionization rates for helium singlets */
void he1gma(void);

/*he1jbr returns continuum occupation number for helium singlet lines */
double he1jbr(long int ihi, 
  long int low);

/*he1lev evaluate ionization balance level populations for helium singlets */
void he1lev(double *he2ov1, 
  float *sm2ov1);

/*he1rad evaluate radiative rates for helium singlets */
void he1rad(void);