{
  "msg": "spc invalid count",
  "req_code": "CASE_SPC_INVALID_001",
  "req_from": "wasm_test",
  "req_cmd": "Cmd_Spc",
  "req_param": {
    "n": 5,
    "k": 2,
    "usl": 1.7,
    "lsl": 1.5,
    "x": [1.55, 1.58, 1.61, 1.6, 1.6]
  }
}