PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-17:57:40
G07     323.8          54.2               10.9 +/-    1.14      13.1 +/-    1.14  0.040 / 0.080
G08     115.1          49.9               13.4 +/-    0.48      16.9 +/-    0.48  0.040 / 0.090
G09     210.3          79.8               11.5 +/-    0.68      11.7 +/-    0.68  0.040 / 0.080
G16     45.2           10.9                7.7 +/-    1.54      21.0 +/-    1.54  0.050 / 0.090
G23     151.7          43.5               12.9 +/-    0.50      17.8 +/-    0.50  0.040 / 0.070
G27     60.8           34.1               10.6 +/-    0.76      17.1 +/-    0.76  0.040 / 0.060
G28     233.0          25.1               15.2 +/-    3.16      29.6 +/-    3.16  0.160 / 0.580
G30     298.1          32.6                8.9 +/-    0.95      14.8 +/-    0.95  0.130 / 0.430