PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/13-12:43:00
G02     204.0          32.6                4.5 +/-    2.80       7.5 +/-    2.80  0.060 / 0.050
G06     155.7          69.8                4.6 +/-    0.23       4.9 +/-    0.23  0.080 / 0.080
G12     307.2          16.0                1.6 +/-    2.29       3.8 +/-    2.29  0.030 / 0.050
G17     33.7           50.9                3.7 +/-    0.97       4.6 +/-    0.97  0.070 / 0.050
G19     5.7            64.3                3.9 +/-    0.62       4.3 +/-    0.62  0.040 / 0.030
G24     298.4          37.1                2.5 +/-    3.59       3.8 +/-    3.59  0.040 / 0.030
G28     98.7           37.2                5.5 +/-    1.40       8.3 +/-    1.40  0.030 / 0.020