PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-10:43:00
G01     77.1           33.3                4.8 +/-    1.44       7.8 +/-    1.44  0.030 / 0.040
G07     134.2          35.0                6.4 +/-    1.41      10.2 +/-    1.41  0.030 / 0.040
G11     56.7           33.2                3.5 +/-    0.93       5.8 +/-    0.93  0.040 / 0.080
G13     280.8          38.1                4.5 +/-    0.58       6.7 +/-    0.58  0.040 / 0.070
G15     311.2          11.1                2.0 +/-    2.91       5.6 +/-    2.91  0.080 / 0.130
G17     225.3          66.1                8.3 +/-    1.48       9.0 +/-    1.48  0.060 / 0.120
G18     52.2           19.7                4.0 +/-    1.43       8.9 +/-    1.43  0.070 / 0.130
G19     220.5          32.7                4.2 +/-    3.22       7.0 +/-    3.22  0.070 / 0.130
G28     8.1            60.7                4.2 +/-    0.86       4.7 +/-    0.86  0.090 / 0.200
G30     128.7          68.6                7.1 +/-    0.59       7.5 +/-    0.59  0.080 / 0.240