PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-18:27:50
G07     329.8          56.7               11.4 +/-    0.47      13.3 +/-    0.47  0.040 / 0.010
G08     108.7          52.0               13.8 +/-    0.52      17.0 +/-    0.52  0.040 / 0.020
G09     196.9          75.8               12.0 +/-    0.36      12.3 +/-    0.36  0.050 / 0.090
G11     148.3          11.6               15.3 +/-    5.91      41.1 +/-    5.91  0.060 / 0.090
G23     153.5          39.2               13.3 +/-    0.95      19.7 +/-    0.95  0.040 / 0.020
G27     56.2           32.1                9.7 +/-    1.33      16.3 +/-    1.33  0.040 / 0.030
G28     236.3          28.7               14.2 +/-    2.18      25.6 +/-    2.18  0.100 / 0.060
G30     301.8          35.6               11.7 +/-    1.11      18.3 +/-    1.11  0.090 / 0.040