arm

var spanGroupData = [ {"timestamp": 1238569200, "group": [ {"author_id": 1, "token_count": 4}, ]}, {"timestamp": 1241161200, "group": [ {"author_id": 6, "token_count": 2}, ]}, {"timestamp": 1259654400, "group": [ {"author_id": 3, "token_count": 7}, ]}, {"timestamp": 1267430400, "group": [ {"author_id": 7, "token_count": 1}, ]}, {"timestamp": 1380610800, "group": [ {"author_id": 4, "token_count": 4}, ]}, {"timestamp": 1430463600, "group": [ {"author_id": 0, "token_count": 7}, ]}, {"timestamp": 1467356400, "group": [ {"author_id": 0, "token_count": 663}, ]}, {"timestamp": 1472713200, "group": [ {"author_id": 2, "token_count": 16}, ]}, {"timestamp": 1483257600, "group": [ {"author_id": 1, "token_count": 25}, ]}, {"timestamp": 1488355200, "group": [ {"author_id": 0, "token_count": 42}, ]}, {"timestamp": 1493622000, "group": [ {"author_id": 1, "token_count": 26}, ]}, {"timestamp": 1498892400, "group": [ {"author_id": 0, "token_count": 7}, {"author_id": 1, "token_count": 12}, ]}, {"timestamp": 1509519600, "group": [ {"author_id": 0, "token_count": 18}, {"author_id": 5, "token_count": 3}, ]}, {"timestamp": 1522566000, "group": [ {"author_id": 1, "token_count": 9}, ]}, {"timestamp": 1525158000, "group": [ {"author_id": 0, "token_count": 16}, ]}, {"timestamp": 1527836400, "group": [ {"author_id": 1, "token_count": 4}, ]}, {"timestamp": 1535785200, "group": [ {"author_id": 0, "token_count": 17}, ]}, {"timestamp": 1561964400, "group": [ {"author_id": 0, "token_count": 42}, ]}, {"timestamp": 1567321200, "group": [ {"author_id": 0, "token_count": 9}, ]}, {"timestamp": 1575187200, "group": [ {"author_id": 0, "token_count": 4}, ]}, ]