PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/28-01:28:00
G01     55.5           28.6                3.2 +/-    1.70       5.7 +/-    1.70  0.030 / 0.050
G06     180.2          18.1                8.2 +/-    3.53      18.8 +/-    3.53  0.030 / 0.030
G07     144.3          18.3                5.6 +/-    0.88      12.9 +/-    0.88  0.150 / 0.090
G11     47.6           22.7                3.1 +/-    1.68       6.4 +/-    1.68  0.140 / 0.080
G13     257.9          33.3                4.9 +/-    3.19       8.1 +/-    3.19  0.020 / 0.020
G15     288.7          16.7                6.2 +/-    1.43      14.9 +/-    1.43  0.030 / 0.020
G17     273.5          77.0                5.4 +/-    0.64       5.5 +/-    0.64  0.110 / 0.230
G19     238.4          55.1                6.7 +/-    1.93       8.0 +/-    1.93  0.150 / 0.220
G28     44.2           54.8                5.1 +/-    0.97       6.1 +/-    0.97  0.090 / 0.150
G30     145.7          43.6                6.8 +/-    0.77       9.3 +/-    0.77  0.140 / 0.230