I have a csv file that looks like this:
;a1;;;;;;a2;;;;; ;b1;;;b2;;;b1;;;b2;; ;c1;c2;c3;c1;c2;c3;c1;c2;c3;c1;c2;c3 0;0.9803;0.6223;0.3398;0.1376;0.3197;0.4410