胡立阳的地心引力源码附图

em30:=ema(c,30);
em72:=ema(c,72);
DXYL:(em30+em72)/2,POINTDOT,LINETHICK2;
dxyl1:dxyl*0.9,POINTDOT,LINETHICK1;
dxyl2:dxyl*1.1,POINTDOT,LINETHICK1;
dxyl4:dxyl2*1.1,POINTDOT,LINETHICK1;
dxyl3:dxyl1*0.9,POINTDOT,LINETHICK1;