PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-10:57:20
G02     26.2           61.8                3.5 +/-    0.36       3.9 +/-    0.36  0.030 / 0.040
G05     152.2          53.1                8.4 +/-    0.91      10.2 +/-    0.91  0.030 / 0.040
G12     230.8          77.3                3.2 +/-    0.42       3.2 +/-    0.42  0.240 / 0.510
G19     92.9           14.6                5.2 +/-    0.91      13.0 +/-    0.91  0.170 / 0.460
G20     198.9          14.8                1.4 +/-    3.83       3.6 +/-    3.83  0.030 / 0.040
G25     308.1          46.5                2.7 +/-    1.48       3.5 +/-    1.48  0.020 / 0.030
G29     302.3          24.5                2.6 +/-    1.40       5.2 +/-    1.40  0.040 / 0.060