PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-18:12:50
G01     107.6          25.4               11.3 +/-    1.23      21.8 +/-    1.23  0.030 / 0.030
G07     105.9          59.0               12.8 +/-    0.25      14.7 +/-    0.25  0.030 / 0.040
G08     42.3           22.7                8.1 +/-    0.95      16.7 +/-    0.95  0.070 / 0.160
G09     175.0          14.1               16.5 +/-    3.18      41.9 +/-    3.18  0.070 / 0.130
G11     90.7           43.0               11.9 +/-    0.61      16.6 +/-    0.61  0.030 / 0.070
G13     310.1          28.2               10.9 +/-    1.52      19.8 +/-    1.52  0.020 / 0.030
G17     206.5          34.5               15.7 +/-    1.33      25.1 +/-    1.33  0.040 / 0.060
G18     81.2           24.3               11.3 +/-    1.76      22.5 +/-    1.76  0.050 / 0.060
G28     317.4          60.9               11.8 +/-    0.60      13.3 +/-    0.60  0.030 / 0.070
G30     25.4           78.0               12.3 +/-    0.57      12.6 +/-    0.57  0.030 / 0.080