/*backtest
start: 2016-01-01 00:00:00
end: 2018-01-30 19:00:00
period: 1m
exchanges: [{"eid":"Futures_CTP","currency":"FUTURES","minfee":3,"fee":[0,0]}]
*/

function NewSymbol(q, a, b) {
    var self = {
        q: q,
        a: a,
        b: b