PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-05:43:00
G01     71.1           32.9                2.3 +/-    1.04       3.8 +/-    1.04  0.040 / 0.040
G07     137.2          30.8                6.0 +/-    0.66      10.3 +/-    0.66  0.040 / 0.030
G11     54.5           31.2                3.3 +/-    1.54       5.7 +/-    1.54  0.030 / 0.020
G13     276.4          37.1                3.0 +/-    2.19       4.6 +/-    2.19  0.030 / 0.020
G15     302.3          15.7               -0.1 +/-    1.23      -0.2 +/-    1.23  0.090 / 0.200
G17     233.6          69.6                6.5 +/-    0.56       6.9 +/-    0.56  0.090 / 0.200
G19     224.1          43.0                5.7 +/-    2.06       7.9 +/-    2.06  0.040 / 0.080
G28     20.4           59.0                2.9 +/-    2.47       3.4 +/-    2.47  0.060 / 0.090
G30     134.7          60.1                7.0 +/-    0.57       8.0 +/-    0.57  0.060 / 0.090