PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/17-07:13:10
G01     40.4           15.0                1.7 +/-    1.92       4.3 +/-    1.92  0.060 / 0.070
G02     198.8          11.2                0.4 +/-    9.14       1.0 +/-    9.14  0.070 / 0.070
G06     179.0          36.7                7.4 +/-    1.69      11.4 +/-    1.69  0.160 / 0.200
G13     237.4          20.9                5.2 +/-    3.09      11.3 +/-    3.09  0.180 / 0.240
G15     268.7          11.9                5.6 +/-    1.99      14.9 +/-    1.99  0.040 / 0.030
G17     7.2            68.4                5.2 +/-    0.71       5.6 +/-    0.71  0.040 / 0.030
G19     286.6          70.8                6.2 +/-    0.91       6.5 +/-    0.91  0.150 / 0.230
G24     316.5          19.6                3.5 +/-    2.11       7.9 +/-    2.11  0.160 / 0.320
G28     74.8           45.4                5.3 +/-    0.68       7.1 +/-    0.68  0.060 / 0.080
G30     154.5          24.2                6.5 +/-    1.30      13.0 +/-    1.30  0.050 / 0.080