/* dhla.h */
EXTERN struct t_dhla {
	double DustHeatLya, 
	  dstpow, 
	  dstsum, 
	  dincon, 
	  dstotl, 
	  dhcol, 
	  HDustDif;
	}	dhla;

/*
 *     HDustDif is heating of grains in current zone due to diffuse fields
 *DustHeatLya is heating of dust due to Lya
 */