PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-19:27:50
G01     129.3          9.9               -10.8 +/-   36.68     -30.1 +/-   36.68  0.040 / 0.060
G07     42.3           69.9               13.0 +/-    0.62      13.8 +/-    0.62  0.220 / 0.230
G08     55.4           45.3               12.4 +/-    0.97      16.7 +/-    0.97  0.120 / 0.270
G09     179.1          39.8               15.5 +/-    0.97      22.7 +/-    0.97  0.260 / 0.340
G11     123.3          33.2               15.4 +/-    1.86      25.3 +/-    1.86  0.170 / 0.320
G18     107.0          15.1               15.9 +/-    1.96      39.5 +/-    1.96  0.150 / 0.350
G28     272.4          51.7               14.7 +/-    2.72      18.1 +/-    2.72  0.030 / 0.040
G30     332.2          59.7               11.2 +/-    0.68      12.7 +/-    0.68  0.030 / 0.030