PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-14:12:40
G01     67.0           32.1                6.3 +/-    1.48      10.6 +/-    1.48  0.070 / 0.120
G07     138.9          25.4                9.1 +/-    1.02      17.7 +/-    1.02  0.050 / 0.140
G11     50.8           26.1                6.2 +/-    1.18      11.9 +/-    1.18  0.030 / 0.040
G13     273.1          36.4                8.4 +/-    1.42      13.0 +/-    1.42  0.030 / 0.050
G15     302.2          14.9                3.1 +/-    2.31       7.7 +/-    2.31  0.040 / 0.130
G17     242.6          74.4                7.6 +/-    0.53       7.9 +/-    0.53  0.040 / 0.130
G19     226.9          46.9                9.5 +/-    0.90      12.5 +/-    0.90  0.030 / 0.030
G28     25.2           58.3                6.9 +/-    0.52       7.9 +/-    0.52  0.030 / 0.040
G30     137.8          61.0                8.7 +/-    0.51       9.8 +/-    0.51  0.040 / 0.080