PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-23:12:40
G02     199.6          20.4               19.5 +/-    1.89      42.4 +/-    1.89  0.050 / 0.040
G06     171.4          52.4               15.6 +/-    0.79      19.1 +/-    0.79  0.040 / 0.040
G13     228.7          14.1               18.2 +/-    1.81      46.4 +/-    1.81  0.140 / 0.080
G17     11.6           64.5                8.8 +/-    0.70       9.6 +/-    0.70  0.140 / 0.090
G19     314.9          71.0               10.8 +/-    0.46      11.3 +/-    0.46  0.210 / 0.300
G24     311.1          28.4                9.3 +/-    1.10      16.8 +/-    1.10  0.400 / 0.300
G28     86.6           40.3               11.7 +/-    1.39      17.0 +/-    1.39  0.090 / 0.150
G30     156.4          14.5               18.2 +/-    1.60      45.8 +/-    1.60  0.280 / 0.110