One may wonder why the value of c is a complicated rational fraction while wstatic is so simple. This is because wstatic was introduced precisely to measure the amount of ambiguities of certain integrals, while, by contrast, c was introduced as an unknown constant entering the relation between the arbitrary scales ' ' r1,r2 on the one hand, and s1,s2 on the other hand, which has a priori nothing to do with ambiguities of integrals.