PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-20:27:50
G01     105.7          26.3               15.1 +/-    1.29      28.6 +/-    1.29  0.170 / 0.160
G07     108.7          57.7               14.9 +/-    0.50      17.2 +/-    0.50  0.170 / 0.220
G08     42.3           22.7                9.7 +/-    1.71      20.1 +/-    1.71  0.070 / 0.140
G09     175.0          12.9               20.5 +/-    3.09      53.6 +/-    3.09  0.080 / 0.120
G11     89.2           43.3               15.9 +/-    1.05      22.0 +/-    1.05  0.070 / 0.140
G13     308.7          29.2               12.6 +/-    1.28      22.5 +/-    1.28  0.060 / 0.160
G18     79.4           24.6               14.6 +/-    2.17      28.9 +/-    2.17  0.030 / 0.030
G19     209.6          13.6               22.8 +/-    1.98      58.8 +/-    1.98  0.020 / 0.020
G28     321.6          61.3               12.8 +/-    0.80      14.4 +/-    0.80  0.030 / 0.040
G30     40.7           78.7               13.6 +/-    1.00      13.8 +/-    1.00  0.020 / 0.040