PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-07:57:40
G01     124.2          13.9                4.6 +/-    2.63      11.7 +/-    2.63  0.040 / 0.060
G07     66.3           67.8                5.0 +/-    0.38       5.3 +/-    0.38  0.040 / 0.050
G08     47.6           35.5                2.4 +/-    0.98       3.7 +/-    0.98  0.030 / 0.040
G09     177.1          31.8                6.5 +/-    0.70      10.9 +/-    0.70  0.030 / 0.030
G11     113.3          36.2                7.7 +/-    0.88      12.0 +/-    0.88  0.070 / 0.080
G13     320.9          12.8                1.6 +/-    2.67       4.2 +/-    2.67  0.070 / 0.120
G17     199.8          20.2                5.8 +/-    1.70      12.8 +/-    1.70  0.040 / 0.070
G28     282.7          55.0                5.2 +/-    1.02       6.1 +/-    1.02  0.040 / 0.070
G30     337.0          62.9                3.8 +/-    0.83       4.2 +/-    0.83  0.060 / 0.200