PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-17:57:50
G01     117.4          19.2               13.4 +/-    1.79      29.9 +/-    1.79  0.130 / 0.150
G07     84.9           65.9               11.9 +/-    0.43      12.9 +/-    0.43  0.120 / 0.160
G08     44.8           31.9                9.2 +/-    1.37      15.5 +/-    1.37  0.040 / 0.030
G09     176.8          24.0               12.0 +/-    1.35      23.9 +/-    1.35  0.040 / 0.030
G11     105.3          40.7               11.9 +/-    0.76      17.1 +/-    0.76  0.110 / 0.190
G13     316.8          20.9                9.2 +/-    1.77      19.8 +/-    1.77  0.100 / 0.190
G17     203.1          23.9               12.2 +/-    1.65      24.6 +/-    1.65  0.050 / 0.050
G18     92.5           21.6               11.5 +/-    1.47      24.3 +/-    1.47  0.040 / 0.050
G28     296.9          58.2               10.3 +/-    1.06      11.9 +/-    1.06  0.030 / 0.030
G30     352.6          70.9               11.3 +/-    0.72      11.9 +/-    0.72  0.030 / 0.040