PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-18:57:40
G01     82.0           33.1               10.3 +/-    1.18      17.0 +/-    1.18  0.140 / 0.200
G07     131.3          39.8               12.1 +/-    1.08      17.7 +/-    1.08  0.150 / 0.210
G11     62.0           37.1               11.7 +/-    0.75      17.9 +/-    0.75  0.040 / 0.020
G13     286.4          37.4               14.0 +/-    1.72      21.3 +/-    1.72  0.040 / 0.020
G15     310.8          12.4               10.9 +/-    1.57      28.8 +/-    1.57  0.040 / 0.050
G17     220.9          57.3               14.0 +/-    1.84      16.2 +/-    1.84  0.040 / 0.060
G18     57.3           22.2                9.9 +/-    2.57      20.6 +/-    2.57  0.040 / 0.040
G19     218.3          31.9               12.7 +/-    1.26      21.3 +/-    1.26  0.030 / 0.050
G28     3.0            61.0               10.7 +/-    0.71      12.0 +/-    0.71  0.090 / 0.180
G30     122.5          69.8               13.5 +/-    0.72      14.3 +/-    0.72  0.090 / 0.210