PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/13-04:12:40
G01     66.7           32.3                6.1 +/-    1.19      10.2 +/-    1.19  0.050 / 0.040
G07     139.4          27.7                7.7 +/-    0.68      14.1 +/-    0.68  0.040 / 0.050
G11     52.4           29.3                4.4 +/-    1.93       7.8 +/-    1.93  0.130 / 0.250
G13     271.3          36.6                3.9 +/-    1.75       6.0 +/-    1.75  0.130 / 0.230
G15     298.7          16.4                3.2 +/-    2.39       7.7 +/-    2.39  0.020 / 0.030
G17     241.1          72.0                6.5 +/-    0.50       6.8 +/-    0.50  0.030 / 0.040
G19     227.2          46.2                5.2 +/-    2.36       6.8 +/-    2.36  0.080 / 0.090
G28     27.0           58.1                6.2 +/-    1.30       7.1 +/-    1.30  0.070 / 0.100
G30     138.3          55.3                7.1 +/-    0.92       8.4 +/-    0.92  0.050 / 0.050