PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-17:28:00
G08     303.4          21.1                5.7 +/-    2.70      12.3 +/-    2.70  0.050 / 0.080
G10     344.9          61.6                5.6 +/-    0.41       6.2 +/-    0.41  0.070 / 0.100
G14     222.6          37.5                8.1 +/-    1.70      12.2 +/-    1.70  0.050 / 0.080
G18     52.4           54.8                6.2 +/-    0.36       7.4 +/-    0.36  0.040 / 0.070
G21     139.7          44.7                7.4 +/-    1.20      10.1 +/-    1.20  0.040 / 0.080
G24     67.0           29.6                6.9 +/-    0.49      12.1 +/-    0.49  0.050 / 0.090
G27     264.2          35.7                8.4 +/-    1.21      13.1 +/-    1.21  0.030 / 0.040
G32     230.8          58.3                8.9 +/-    0.89      10.2 +/-    0.89  0.030 / 0.030