PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-08:57:40
G02     217.5          64.4                4.6 +/-    1.01       5.0 +/-    1.01  0.310 / 0.390
G06     60.1           78.7                2.3 +/-    0.54       2.4 +/-    0.54  0.230 / 0.330
G12     319.0          36.7                2.6 +/-    1.75       4.0 +/-    1.75  0.050 / 0.080
G17     60.1           30.2                2.6 +/-    1.75       4.6 +/-    1.75  0.040 / 0.080
G19     43.6           46.6                2.0 +/-    1.11       2.6 +/-    1.11  0.040 / 0.070
G24     264.0          40.8                3.5 +/-    2.84       5.1 +/-    2.84  0.050 / 0.070
G28     124.6          11.1                6.0 +/-    1.68      16.5 +/-    1.68  0.020 / 0.020