/* nustbl.h */
EXTERN struct t_nustbl {
	long int nUnstable;
	int lgUnstable;
	}	nustbl;

/*
 *keep track of possibly thermall unstagle models
 *nUnstable is number of zones that were possibly thermall unstable
 *lgUnstable is set in ionte and says that current consitions possibly unstable
 */