\vbox{\line{\hfill \diagram{\xaxis9truecm,0.,100.0,20.0,$w_{\rm Ca(N_3)_2}$ [\%]; \yaxis10truecm,-30.0,80.0,10.0,$T$ [$^\circ$\thinspace C]; \nogrid}{\connect{\point0.0,-20.8;\point63.3,-20.8;} \connect{\point63.3,-30.0;\point63.3,0.5;} \connect{\point82.1,-30.0;\point82.1,25.0;} \connect{\point93.2,-30.0;\point93.2,41.5;} \connect{\point32.,0.5;\point82.1,0.5;} \connect{\point37.,25.0;\point93.2,25.0;} \connect{\point41.,41.5;\point100.0,41.5;} \connect{\point100.,-30.0;\point100.0,80.0;} \connect{\point0.0,0.0;\point28.3,-20.8;\point32.,0.5; \point37.,25.0;\point41.,41.5;\point43.,80.0;}} \hfill} \medskip \centerline{\bf Figure~16. \rm Phase diagram of the H$_2\!$O -- Ca(N$_3$)$_2$ system (simplified).}}