bug fix in pastro
\frac{f(x)}{b(x)}=Ae^{x} and \int f(x)dx =1 = \int dx b(x) which means A=\frac{1}{ \frac{\int dxb(x)e^{x}}{\int dy b(y)}}
\frac{f(x)}{b(x)}=Ae^{x} and \int f(x)dx =1 = \int dx b(x) which means A=\frac{1}{ \frac{\int dxb(x)e^{x}}{\int dy b(y)}}