PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/17-10:13:10
G07     52.0           68.7                4.7 +/-    1.04       5.0 +/-    1.04  0.030 / 0.040
G08     55.9           45.8                3.7 +/-    1.39       4.9 +/-    1.39  0.040 / 0.030
G09     178.3          39.6                5.8 +/-    0.93       8.5 +/-    0.93  0.070 / 0.290
G11     122.1          34.5                4.9 +/-    0.72       7.9 +/-    0.72  0.100 / 0.250
G18     105.5          15.2                3.5 +/-    1.56       8.7 +/-    1.56  0.030 / 0.030
G27     37.6           10.0                2.2 +/-    3.64       6.0 +/-    3.64  0.040 / 0.030
G28     265.5          45.8                5.9 +/-    2.88       7.8 +/-    2.88  0.090 / 0.300
G30     329.1          58.2                3.8 +/-    0.57       4.4 +/-    0.57  0.090 / 0.370