PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-19:13:00
G01     127.4          11.5               16.9 +/-    2.03      45.7 +/-    2.03  0.120 / 0.260
G07     49.9           69.8               13.9 +/-    0.49      14.7 +/-    0.49  0.120 / 0.220
G08     52.9           43.2               11.1 +/-    0.92      15.3 +/-    0.92  0.040 / 0.050
G09     178.7          37.1               14.7 +/-    0.84      22.5 +/-    0.84  0.040 / 0.050
G11     120.6          34.7               14.6 +/-    0.64      23.3 +/-    0.64  0.290 / 0.320
G13     321.4          11.0               -0.2 +/-   22.24      -0.5 +/-   22.24  0.160 / 0.400
G17     201.4          10.7               -2.7 +/-   25.30      -7.3 +/-   25.30  0.030 / 0.030
G18     104.7          16.4               13.6 +/-    1.93      32.7 +/-    1.93  0.030 / 0.030
G28     276.1          53.0               13.6 +/-    3.47      16.6 +/-    3.47  0.030 / 0.030
G30     334.9          61.5               13.0 +/-    0.52      14.5 +/-    0.52  0.030 / 0.040