PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/17-06:12:40
G01     61.8           31.0                3.4 +/-    0.92       5.7 +/-    0.92  0.040 / 0.040
G07     141.5          23.3                6.1 +/-    2.90      12.5 +/-    2.90  0.040 / 0.050
G11     49.4           25.2                3.7 +/-    1.88       7.2 +/-    1.88  0.100 / 0.190
G13     266.0          35.5                8.2 +/-    1.88      13.0 +/-    1.88  0.090 / 0.160
G15     294.8          16.7                3.4 +/-    0.95       8.2 +/-    0.95  0.030 / 0.020
G17     255.8          76.2                6.7 +/-    0.46       6.9 +/-    0.46  0.030 / 0.030
G19     231.5          50.6                8.7 +/-    1.76      10.9 +/-    1.76  0.070 / 0.070
G28     34.4           56.8                5.3 +/-    1.27       6.2 +/-    1.27  0.050 / 0.060
G30     141.9          52.1                9.1 +/-    0.62      11.2 +/-    0.62  0.090 / 0.150