PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-05:27:50
G01     74.9           33.2                2.4 +/-    1.04       3.9 +/-    1.04  0.030 / 0.040
G07     135.3          33.8                6.6 +/-    0.69      10.7 +/-    0.69  0.040 / 0.040
G11     57.0           33.3                2.5 +/-    1.71       4.0 +/-    1.71  0.040 / 0.030
G13     280.4          37.2                3.7 +/-    1.44       5.6 +/-    1.44  0.040 / 0.030
G15     305.1          15.0               -0.2 +/-    2.66      -0.5 +/-    2.66  0.080 / 0.190
G17     228.2          66.7                5.6 +/-    0.81       6.0 +/-    0.81  0.080 / 0.190
G19     221.8          40.0                6.9 +/-    1.89      10.0 +/-    1.89  0.060 / 0.090
G28     14.7           59.8                2.3 +/-    0.61       2.6 +/-    0.61  0.220 / 0.270
G30     131.1          63.1                6.3 +/-    0.22       7.0 +/-    0.22  0.070 / 0.100