PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-19:57:50
G01     113.5          21.9               17.0 +/-    1.51      35.9 +/-    1.51  0.110 / 0.180
G07     94.4           63.4               16.3 +/-    0.31      18.0 +/-    0.31  0.120 / 0.150
G08     43.8           29.5               13.6 +/-    1.18      24.1 +/-    1.18  0.140 / 0.070
G09     176.5          20.3               18.3 +/-    3.00      40.0 +/-    3.00  0.100 / 0.110
G11     100.5          42.1               15.8 +/-    0.92      22.3 +/-    0.92  0.090 / 0.210
G13     314.5          23.9               12.7 +/-    1.22      25.5 +/-    1.22  0.100 / 0.140
G17     204.8          26.8               17.0 +/-    1.32      31.9 +/-    1.32  0.020 / 0.030
G18     88.2           23.0               14.3 +/-    1.59      29.2 +/-    1.59  0.020 / 0.030
G28     305.4          59.6               13.9 +/-    1.00      15.9 +/-    1.00  0.040 / 0.030
G30     6.5            74.6               16.9 +/-    0.64      17.4 +/-    0.64  0.030 / 0.030