卖出撤单:WIDTHDRAWORDER(2),colorred,linethick1;
买进撤单:WIDTHDRAWORDER(1),colorgreen,linethick1;
撤卖单累计:sum(卖出撤单,0)/20,colorblue,linethick2;
撤买单累计:sum(买进撤单,0)/20,colorwhite,linethick2;
净撤量:撤卖单累计-撤买单累计;