PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-02:27:50
G01     45.4           21.5                3.2 +/-    1.10       6.8 +/-    1.10  0.020 / 0.030
G06     178.0          30.0                8.2 +/-    1.60      14.4 +/-    1.60  0.040 / 0.040
G11     44.2           12.1                2.9 +/-    2.73       7.8 +/-    2.73  0.130 / 0.100
G13     245.0          26.6                6.5 +/-    1.76      12.2 +/-    1.76  0.080 / 0.120
G15     276.8          14.7                5.1 +/-    2.79      12.8 +/-    2.79  0.030 / 0.060
G17     335.2          76.0                5.6 +/-    0.67       5.8 +/-    0.67  0.040 / 0.060
G19     259.6          65.2                3.1 +/-    0.70       3.4 +/-    0.70  0.080 / 0.130
G24     318.6          12.6                3.8 +/-    1.58      10.1 +/-    1.58  0.080 / 0.180
G28     62.6           49.8                4.2 +/-    1.05       5.3 +/-    1.05  0.120 / 0.190
G30     151.2          30.8                8.1 +/-    1.24      14.0 +/-    1.24  0.120 / 0.180