PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-13:58:00
G02     218.1          57.6                6.8 +/-    1.13       7.9 +/-    1.13  0.080 / 0.060
G06     53.7           72.2                6.7 +/-    0.65       7.0 +/-    0.65  0.090 / 0.070
G12     319.8          40.2                4.9 +/-    1.33       7.1 +/-    1.33  0.050 / 0.070
G17     59.5           30.0                6.8 +/-    3.61      12.0 +/-    3.61  0.060 / 0.070
G19     35.6           51.7                6.7 +/-    2.04       8.2 +/-    2.04  0.030 / 0.020
G24     259.8          41.7                7.0 +/-    1.90      10.0 +/-    1.90  0.040 / 0.020
G28     123.3          13.5                7.8 +/-    1.70      20.0 +/-    1.70  0.040 / 0.040