PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-13:58:00
G02     296.5          81.8                4.6 +/-    0.43       4.6 +/-    0.43  0.060 / 0.160
G05     169.9          24.0                8.6 +/-    1.91      17.2 +/-    1.91  0.060 / 0.140
G06     39.6           50.4                4.4 +/-    1.10       5.5 +/-    1.10  0.090 / 0.150
G12     319.1          61.9                4.1 +/-    0.93       4.6 +/-    0.93  0.080 / 0.130
G17     81.0           14.1                5.5 +/-    2.11      13.9 +/-    2.11  0.020 / 0.050
G19     69.0           30.6                5.7 +/-    1.15       9.8 +/-    1.15  0.040 / 0.040
G24     236.6          28.6                6.5 +/-    1.95      11.7 +/-    1.95  0.040 / 0.050
G25     317.8          23.4                3.8 +/-    2.28       7.6 +/-    2.28  0.040 / 0.050