{
  "traceEvents": [
    {"name": "us1", "ph": "B", "pid": 1, "tid": 1, "ts": 0},
    {"name": "us1", "ph": "E", "pid": 1, "tid": 1, "ts": 1.1},
    {"name": "us2", "ph": "B", "pid": 1, "tid": 1, "ts": 1.1},
    {"name": "us2", "ph": "E", "pid": 1, "tid": 1, "ts": 1.3},
    {"name": "us3", "ph": "B", "pid": 1, "tid": 1, "ts": 1.3},
    {"name": "us3", "ph": "E", "pid": 1, "tid": 1, "ts": 1.6},
    {"name": "us4", "ph": "B", "pid": 1, "tid": 1, "ts": 1.7},
    {"name": "us4", "ph": "E", "pid": 1, "tid": 1, "ts": 2.1},

    {"name": "ns1", "ph": "B", "pid": 1, "tid": 1, "ts": 3.000},
    {"name": "ns1", "ph": "E", "pid": 1, "tid": 1, "ts": 3.011},
    {"name": "ns2", "ph": "B", "pid": 1, "tid": 1, "ts": 3.011},
    {"name": "ns2", "ph": "E", "pid": 1, "tid": 1, "ts": 3.013},
    {"name": "ns3", "ph": "B", "pid": 1, "tid": 1, "ts": 3.013},
    {"name": "ns3", "ph": "E", "pid": 1, "tid": 1, "ts": 3.016},
    {"name": "ns4", "ph": "B", "pid": 1, "tid": 1, "ts": 3.017},
    {"name": "ns4", "ph": "E", "pid": 1, "tid": 1, "ts": 3.021}
  ],
  "displayTimeUnit": "ns"
}