PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/28-09:27:50
G01     66.6           32.2                4.4 +/-    0.81       7.4 +/-    0.81  0.040 / 0.070
G07     139.3          26.4                7.6 +/-    2.34      14.3 +/-    2.34  0.050 / 0.060
G11     51.2           27.1                2.5 +/-    1.47       4.6 +/-    1.47  0.040 / 0.090
G13     272.0          36.4                5.5 +/-    1.67       8.5 +/-    1.67  0.040 / 0.090
G15     299.7          16.0                3.3 +/-    2.02       7.9 +/-    2.02  0.020 / 0.030
G17     243.5          74.2                6.0 +/-    0.49       6.2 +/-    0.49  0.030 / 0.040
G19     227.4          47.1                6.5 +/-    1.52       8.5 +/-    1.52  0.100 / 0.370
G28     26.9           58.1                2.6 +/-    0.67       3.1 +/-    0.67  0.130 / 0.380
G30     138.4          58.5                6.5 +/-    0.67       7.5 +/-    0.67  0.050 / 0.070