PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/18-14:28:00
G02     57.0           34.4                8.1 +/-    1.46      12.9 +/-    1.46  0.020 / 0.020
G05     67.4           65.8                8.8 +/-    0.56       9.6 +/-    0.56  0.040 / 0.020
G12     187.2          38.3               10.5 +/-    0.90      15.8 +/-    0.90  0.110 / 0.180
G13     132.8          12.2               14.5 +/-    2.30      38.5 +/-    2.30  0.190 / 0.280
G20     206.5          53.7               11.1 +/-    0.68      13.5 +/-    0.68  0.050 / 0.060
G21     269.1          18.1                6.3 +/-    1.64      14.6 +/-    1.64  0.040 / 0.090
G25     242.1          54.5                7.3 +/-    2.48       8.8 +/-    2.48  0.040 / 0.050
G29     330.0          55.7                6.8 +/-    0.68       8.0 +/-    0.68  0.030 / 0.040