PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-12:41:30
G07     355.0          63.9                5.5 +/-    0.54       6.1 +/-    0.54  0.040 / 0.030
G08     80.4           51.2                3.7 +/-    1.45       4.6 +/-    1.45  0.040 / 0.030
G09     180.2          62.4                5.2 +/-    0.54       5.8 +/-    0.54  0.050 / 0.090
G11     137.1          18.6                5.4 +/-    1.51      12.3 +/-    1.51  0.060 / 0.080
G23     158.3          33.9                5.9 +/-    1.71       9.6 +/-    1.71  0.110 / 0.090
G27     47.1           25.5                5.4 +/-    2.72      10.4 +/-    2.72  0.100 / 0.070
G28     245.3          36.5                6.9 +/-    1.61      10.6 +/-    1.61  0.030 / 0.030
G30     307.6          39.0                4.3 +/-    1.73       6.3 +/-    1.73  0.030 / 0.030