PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-08:42:30
G02     228.3          72.5                5.2 +/-    0.39       5.5 +/-    0.39  0.190 / 0.310
G05     174.1          11.1               -3.6 +/-   14.88      -9.9 +/-   14.88  0.160 / 0.340
G06     43.5           70.2                4.9 +/-    0.78       5.2 +/-    0.78  0.060 / 0.090
G12     320.7          44.3                4.8 +/-    0.52       6.5 +/-    0.52  0.060 / 0.080
G17     66.6           25.5                4.4 +/-    1.70       8.4 +/-    1.70  0.050 / 0.040
G19     52.1           41.5                4.1 +/-    0.83       5.8 +/-    0.83  0.030 / 0.040
G24     253.6          38.0                5.3 +/-    2.34       8.0 +/-    2.34  0.030 / 0.020