1.  dycst=0; no minor ticks. dycst=1; draw minus ticks.
    The length of the ticks are evated by dycst*minor_ticke_length.
2. 0.02mm case without minor ticks will be the same as 0.1mm case. That is why all the rest parameters are the same.
3. n2s is the number of ticks on the scale.