PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/12-09:27:10
G02     216.3          63.0                7.8 +/-    1.08       8.6 +/-    1.08  0.180 / 0.310
G06     63.9           79.1                6.8 +/-    0.49       6.9 +/-    0.49  0.230 / 0.370
G12     318.6          35.5                4.8 +/-    1.90       7.5 +/-    1.90  0.040 / 0.070
G17     59.2           30.8                4.1 +/-    1.12       7.0 +/-    1.12  0.040 / 0.060
G19     42.3           47.4                4.2 +/-    0.95       5.5 +/-    0.95  0.090 / 0.090
G24     265.7          41.1                5.6 +/-    1.13       8.0 +/-    1.13  0.090 / 0.070
G28     123.8          12.0                7.1 +/-    1.61      18.8 +/-    1.61  0.020 / 0.020