PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/31-14:42:40
G01     40.1           15.1                5.1 +/-    1.98      12.7 +/-    1.98  0.040 / 0.050
G06     173.7          39.7                8.5 +/-    0.88      12.5 +/-    0.88  0.060 / 0.080
G13     236.0          22.3                9.1 +/-    1.60      19.0 +/-    1.60  0.020 / 0.030
G15     270.6          12.0                8.2 +/-    2.33      21.8 +/-    2.33  0.030 / 0.040
G17     351.8          72.4                5.7 +/-    0.59       6.0 +/-    0.59  0.040 / 0.040
G19     280.9          70.6                5.6 +/-    0.81       5.9 +/-    0.81  0.040 / 0.050
G28     65.4           51.3                6.8 +/-    1.27       8.5 +/-    1.27  0.060 / 0.080
G30     154.6          26.7                7.6 +/-    0.99      14.2 +/-    0.99  0.060 / 0.080