PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/30-12:27:40
G07     349.7          62.7                3.7 +/-    0.48       4.1 +/-    0.48  0.030 / 0.030
G08     85.0           51.5                4.0 +/-    1.15       5.0 +/-    1.15  0.030 / 0.030
G09     181.1          65.3                3.9 +/-    0.86       4.2 +/-    0.86  0.110 / 0.070
G11     139.0          16.9                4.6 +/-    4.36      10.9 +/-    4.36  0.070 / 0.070
G23     157.7          36.7                4.6 +/-    0.94       7.1 +/-    0.94  0.030 / 0.030
G27     49.0           27.2                2.7 +/-    2.57       5.0 +/-    2.57  0.040 / 0.030
G28     242.9          34.5                4.9 +/-    1.77       7.9 +/-    1.77  0.050 / 0.070
G30     305.5          37.2                3.7 +/-    1.19       5.6 +/-    1.19  0.050 / 0.090