From these curves it will be obvious (or noted, or noticed) that ...
It has been apparent in recent reports that ...
It is evident (or obvious, or clear) from the curve that ...
One can see from the equation that ...
It is (or can be) seen from Fig. 2 that ...
Referring to Fig.5 it will be observed that ...
Reference to Eq. (18-35) shows that ...
With reference to Fig. 16-5, it can be seen that ...