Normalized diffrence for Amibroker (AFL)

_SECTION_BEGIN("normalized_diff");

ticker = ParamStr("Pair ticker", "?");
tsc = Foreign( ticker, "C");

ticker2 = C;

d = abs(C / tsc);

p = Param("Period",10);

nd = (d - MA(d,p)) / MA(d,p);

Plot(nd,"normalized difference",colorRed,styleLine);
Plot(0,"",colorBlue,styleLine|styleNoLabel);
_SECTION_END();