PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/23-12:58:00
G01     103.6          26.3                5.1 +/-    1.11       9.7 +/-    1.11  0.030 / 0.040
G07     112.0          52.9                5.6 +/-    0.57       6.8 +/-    0.57  0.030 / 0.040
G08     42.0           21.3                6.5 +/-    2.58      13.8 +/-    2.58  0.080 / 0.090
G09     174.7          12.5                3.5 +/-    4.84       9.2 +/-    4.84  0.070 / 0.090
G11     85.6           43.7                6.0 +/-    0.92       8.3 +/-    0.92  0.060 / 0.060
G13     307.1          31.2                4.3 +/-    1.29       7.4 +/-    1.29  0.050 / 0.060
G17     206.8          36.7                5.7 +/-    0.79       8.7 +/-    0.79  0.240 / 0.300
G18     76.8           24.4                6.6 +/-    1.00      13.0 +/-    1.00  0.240 / 0.300
G28     310.2          59.0                4.3 +/-    1.18       4.9 +/-    1.18  0.140 / 0.350
G30     40.0           79.3                5.1 +/-    0.54       5.2 +/-    0.54  0.190 / 0.250