PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/27-12:13:00
G02     201.6          17.3                3.1 +/-    1.75       7.2 +/-    1.75  0.100 / 0.100
G06     169.5          54.6                5.9 +/-    1.06       7.1 +/-    1.06  0.110 / 0.110
G13     226.9          13.2                4.2 +/-    1.47      10.9 +/-    1.47  0.190 / 0.220
G17     24.1           58.5                3.7 +/-    0.83       4.3 +/-    0.83  0.160 / 0.270
G19     307.9          69.9                3.6 +/-    0.72       3.8 +/-    0.72  0.140 / 0.400
G24     308.4          31.9                3.7 +/-    1.66       6.3 +/-    1.66  0.090 / 0.190
G28     87.1           40.6                3.5 +/-    1.63       5.1 +/-    1.63  0.040 / 0.040
G30     157.7          16.1                4.7 +/-    1.06      11.5 +/-    1.06  0.040 / 0.040