PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-04:27:50
G01     112.2          22.6                6.8 +/-    1.46      14.1 +/-    1.46  0.030 / 0.050
G07     97.8           61.6                3.8 +/-    0.54       4.3 +/-    0.54  0.040 / 0.050
G08     42.7           24.8                2.1 +/-    1.94       4.1 +/-    1.94  0.020 / 0.040
G09     176.2          19.1                6.4 +/-    1.51      14.4 +/-    1.51  0.030 / 0.040
G11     97.5           41.7                5.5 +/-    0.38       7.8 +/-    0.38  0.070 / 0.080
G13     314.2          23.9                2.7 +/-    3.42       5.5 +/-    3.42  0.060 / 0.080
G17     203.7          33.2                5.6 +/-    1.33       9.2 +/-    1.33  0.060 / 0.100
G28     308.7          60.1                3.6 +/-    0.83       4.1 +/-    0.83  0.050 / 0.110
G30     11.3           75.3                3.6 +/-    0.67       3.7 +/-    0.67  0.090 / 0.230