PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-07:28:00
G02     199.3          18.9                5.5 +/-    2.10      12.5 +/-    2.10  0.070 / 0.070
G06     177.8          45.6                7.6 +/-    0.61      10.1 +/-    0.61  0.060 / 0.080
G13     230.9          15.4                5.4 +/-    2.09      13.4 +/-    2.09  0.030 / 0.030
G17     19.0           61.9                4.9 +/-    0.84       5.5 +/-    0.84  0.050 / 0.030
G19     315.6          71.8                4.4 +/-    0.67       4.6 +/-    0.67  0.050 / 0.050
G24     312.9          26.0                4.0 +/-    1.27       7.6 +/-    1.27  0.060 / 0.050
G28     84.8           41.0                5.4 +/-    1.05       7.8 +/-    1.05  0.260 / 0.310
G30     156.1          16.3                5.8 +/-    2.68      13.9 +/-    2.68  0.130 / 0.350