PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-02:42:40
G01     41.5           16.8                2.9 +/-    1.27       6.9 +/-    1.27  0.030 / 0.030
G06     176.8          37.1                7.3 +/-    1.14      11.2 +/-    1.14  0.030 / 0.030
G13     238.9          22.4                5.2 +/-    2.33      10.8 +/-    2.33  0.090 / 0.090
G15     270.6          12.6                5.7 +/-    1.36      15.1 +/-    1.36  0.080 / 0.100
G17     355.8          71.7                4.9 +/-    0.66       5.1 +/-    0.66  0.040 / 0.080
G19     277.1          69.1                4.0 +/-    0.56       4.3 +/-    0.56  0.040 / 0.080
G24     317.0          18.2                4.4 +/-    2.16      10.1 +/-    2.16  0.140 / 0.160
G28     71.7           46.6                2.9 +/-    0.84       3.8 +/-    0.84  0.130 / 0.210
G30     153.3          24.2                6.4 +/-    1.42      12.8 +/-    1.42  0.070 / 0.270