PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-19:27:40
G01     127.9          11.1               -6.3 +/-   47.24     -17.1 +/-   47.24  0.160 / 0.300
G07     48.0           69.8               12.6 +/-    0.36      13.4 +/-    0.36  0.120 / 0.330
G08     53.6           43.9               11.9 +/-    0.82      16.3 +/-    0.82  0.140 / 0.780
G09     178.9          37.8               14.6 +/-    0.79      22.0 +/-    0.79  0.050 / 0.100
G11     121.4          34.3               15.4 +/-    0.95      24.8 +/-    0.95  0.050 / 0.070
G13     321.5          10.4               -6.8 +/-   15.07     -18.7 +/-   15.07  0.030 / 0.040
G18     105.3          16.1               13.6 +/-    1.68      32.9 +/-    1.68  0.030 / 0.040
G28     275.2          52.7               13.8 +/-    1.32      16.8 +/-    1.32  0.070 / 0.110
G30     334.4          61.1               12.3 +/-    1.02      13.8 +/-    1.02  0.070 / 0.100