PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/17-16:57:40
G02     206.5          41.6                9.6 +/-    0.85      13.6 +/-    0.85  0.060 / 0.090
G06     138.0          76.5                8.7 +/-    0.56       8.9 +/-    0.56  0.070 / 0.080
G12     310.8          20.4                8.1 +/-    1.57      17.6 +/-    1.57  0.060 / 0.140
G17     40.6           45.7                7.8 +/-    0.96      10.4 +/-    0.96  0.060 / 0.130
G19     18.6           59.4                8.9 +/-    0.99      10.2 +/-    0.99  0.170 / 0.220
G24     288.4          40.7                7.4 +/-    4.94      10.6 +/-    4.94  0.110 / 0.290
G28     107.2          31.0                8.4 +/-    1.08      14.3 +/-    1.08  0.040 / 0.060