parsec and sobieczky airfoil parametrization
 

hi
i read some articles about airfoil parametrization using parsec and sobieczky methods.but i could not understand how can i write a code like you can see in this page:
http://www.as.dlr.de/hs/d.PARSEC/Parsec.html

in other words ,i do not know what are the variables used in parsec polynomial formulation'
can anybody help me?