PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/22-01:28:00
G01     127.8          11.1               -1.6 +/-   37.96      -4.4 +/-   37.96  0.040 / 0.070
G07     49.5           69.6                6.2 +/-    0.57       6.6 +/-    0.57  0.050 / 0.070
G08     51.9           41.3                5.0 +/-    0.61       7.1 +/-    0.61  0.030 / 0.040
G09     179.1          38.1                7.7 +/-    0.83      11.5 +/-    0.83  0.030 / 0.040
G11     121.4          34.0                7.9 +/-    1.11      12.8 +/-    1.11  0.040 / 0.050
G17     200.1          13.7                6.5 +/-    2.90      16.7 +/-    2.90  0.040 / 0.050
G28     275.7          52.9                7.2 +/-    1.13       8.7 +/-    1.13  0.060 / 0.250
G30     337.0          62.3                3.4 +/-    0.47       3.8 +/-    0.47  0.130 / 0.300