PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/12-08:12:50
G02     200.6          27.9                6.1 +/-    1.38      11.3 +/-    1.38  0.090 / 0.110
G06     175.2          56.2                9.0 +/-    0.37      10.6 +/-    0.37  0.070 / 0.110
G17     29.5           54.5                5.0 +/-    0.82       6.0 +/-    0.82  0.040 / 0.030
G19     345.6          69.0                4.8 +/-    0.41       5.1 +/-    0.41  0.030 / 0.040
G24     306.8          32.5                2.4 +/-    2.59       4.0 +/-    2.59  0.040 / 0.030
G28     95.0           35.6                6.5 +/-    1.06      10.2 +/-    1.06  0.040 / 0.030