The chart says lists zone exposure in its x-axis and film density in its y-axis. This means if you expose a section of this film at zone 8, you can expect a density of 1.29 over b+f, assuming of course, that you develop exactly like it was done when this chart was made. So what is zone 8? It appears to be 7 stops above the light density which creates about 0.1 density over b+f.

What do I read from this chart? From zone 1 to zone 9 this film has more or less a straight curve which then flattens considerably. Either a compensating film developer was used for this chart, or the film uses DIR couplers to achieve its 14 stop range, or both.