PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/19-07:57:40
G02     216.0          59.6                5.9 +/-    0.86       6.7 +/-    0.86  0.070 / 0.080
G06     61.7           76.6                5.6 +/-    0.59       5.7 +/-    0.59  0.060 / 0.090
G12     318.0          35.0                3.4 +/-    0.95       5.3 +/-    0.95  0.120 / 0.290
G17     58.6           30.2                3.5 +/-    0.56       6.1 +/-    0.56  0.160 / 0.270
G19     36.3           51.0                3.5 +/-    0.81       4.3 +/-    0.81  0.030 / 0.030
G24     259.8          42.4                3.8 +/-    0.86       5.3 +/-    0.86  0.030 / 0.020
G28     121.7          15.8                5.0 +/-    1.24      12.2 +/-    1.24  0.050 / 0.100