PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-07:57:50
G02     200.4          26.7                7.4 +/-    2.27      13.9 +/-    2.27  0.050 / 0.090
G06     175.8          54.7               11.3 +/-    1.33      13.5 +/-    1.33  0.050 / 0.110
G13     225.1          10.2                7.0 +/-    2.47      19.5 +/-    2.47  0.200 / 0.550
G17     28.1           55.5                4.5 +/-    0.52       5.4 +/-    0.52  0.210 / 0.620
G19     342.0          69.6                5.8 +/-    0.84       6.1 +/-    0.84  0.030 / 0.040
G24     307.7          31.7                4.8 +/-    1.07       8.1 +/-    1.07  0.030 / 0.040
G28     93.7           36.4                7.6 +/-    0.84      11.8 +/-    0.84  0.060 / 0.090