/* radius.h */
EXTERN struct t_radiusVar {
	double 
		/* the inner radius in cm */
		rinner, 

		/* the outer radius of the current zone */
		Radius, 

		/* the thickness of the current zone */
		drad, 

		/* the depth, the distance to the illuminated face */
		depth, 

		/* ratio of square of outer edge of current zone to 
		 * radius of illuminated face of cloud - note continuum
		* is relative to outer edge after ZoneDone is called too*/
		r1r0sq,

		/* optional outer radius */
		router[ITRDIM];

	/* next dr, as set in nextdr */
	double drNext;

	/* save initial dr, and drnext */
	double drSave ,
	  drnsv;

	/* sign of dr for going in or out, 1 (usually) or -1 */
	double dRadSign;

	/* dReff is dr * filling factor */
	double dReff;

	/* dVeff is effec vol relative to inner radius */
	double  dVeff;

	/* dRNeff is next dr effective radius */
	double  dRNeff;

	/* following will be used to "uncorrect" for this in lines when predicting continua
	 * set in StartZone */
	double GeoDil;

	/* dVolOutwrd, dVolReflec, outward and reflected effective vols
	 * used to get outward and reflected beams,
	 * these include only the vol of the current shell times the covering
	 * factor, and a number between 0 and 1 that is the fraction of the beam that goes
	 * out or is reflected.  this is determined by the rt covering factor */
	double dVolOutwrd; 
	double dVolReflec;

	/* Beam vars are related to lines where inward and outward fracs known */
	/* BeamInIn inward part of inwardly directed beam, 0 if sphere */
	double BeamInIn;

	/* BeamInOut outward part of inwardly directed beam, 0 if not sphere */
	double BeamInOut;

	/* BeamOutOut outward part of outwardly directed beam */
	double BeamOutOut;

	/* flag saying that zone thickness became too small, likely because
	 * of an uncontrolled oscillation */
	int lgdR2Small;

	/* lgCylnOn set true when cylinder command given
	 * cylind is half height in centimeters */
	double CylindHigh;
	int lgCylnOn;

	/* default inner radius when none set, log r =25 in scalar */
	double rdfalt;

	}	radius;