alpha

var spanGroupData = [ {"timestamp": 1238569200, "group": [ {"author_id": 7, "token_count": 3}, ]}, {"timestamp": 1241161200, "group": [ {"author_id": 4, "token_count": 3}, ]}, {"timestamp": 1357027200, "group": [ {"author_id": 6, "token_count": 3}, ]}, {"timestamp": 1380610800, "group": [ {"author_id": 4, "token_count": 3}, ]}, {"timestamp": 1430463600, "group": [ {"author_id": 2, "token_count": 12}, ]}, {"timestamp": 1443682800, "group": [ {"author_id": 3, "token_count": 10}, ]}, {"timestamp": 1467356400, "group": [ {"author_id": 2, "token_count": 16}, ]}, {"timestamp": 1472713200, "group": [ {"author_id": 1, "token_count": 164}, ]}, {"timestamp": 1509519600, "group": [ {"author_id": 8, "token_count": 3}, ]}, {"timestamp": 1514793600, "group": [ {"author_id": 0, "token_count": 517}, ]}, {"timestamp": 1772352000, "group": [ {"author_id": 5, "token_count": 5}, ]}, ]