PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/31-18:58:00
G01     59.8           30.5               11.4 +/-    0.62      19.7 +/-    0.62  0.160 / 0.370
G07     142.5          22.4               13.2 +/-    0.84      27.4 +/-    0.84  0.130 / 0.340
G11     48.3           24.0               11.0 +/-    0.74      21.9 +/-    0.74  0.090 / 0.140
G13     262.3          35.1               14.8 +/-    0.66      23.4 +/-    0.66  0.060 / 0.150
G15     294.4          16.0               12.2 +/-    1.76      29.6 +/-    1.76  0.030 / 0.040
G17     255.5          74.3               14.1 +/-    0.59      14.6 +/-    0.59  0.030 / 0.050
G18     42.3           12.9                9.9 +/-    1.17      25.9 +/-    1.17  0.060 / 0.060
G19     232.7          49.1               15.4 +/-    1.11      19.6 +/-    1.11  0.040 / 0.060
G28     36.5           56.5               11.3 +/-    0.42      13.3 +/-    0.42  0.040 / 0.070
G30     143.9          51.6               12.9 +/-    1.34      16.0 +/-    1.34  0.030 / 0.060