PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-16:27:50
G02     58.5           33.4                8.9 +/-    0.75      14.5 +/-    0.75  0.030 / 0.040
G05     64.2           65.3                9.6 +/-    0.45      10.4 +/-    0.45  0.040 / 0.040
G12     186.4          35.3               11.5 +/-    1.20      18.2 +/-    1.20  0.090 / 0.270
G13     131.2          13.8               13.5 +/-    2.24      34.6 +/-    2.24  0.110 / 0.210
G15     164.3          10.8                1.4 +/-   32.39       4.0 +/-   32.39  0.050 / 0.080
G20     207.1          57.3               12.1 +/-    0.64      14.1 +/-    0.64  0.040 / 0.100
G21     270.5          18.4                9.2 +/-    1.38      21.0 +/-    1.38  0.190 / 0.430
G25     236.6          52.8               11.1 +/-    0.67      13.5 +/-    0.67  0.150 / 0.470
G29     332.1          58.1                8.0 +/-    0.70       9.2 +/-    0.70  0.040 / 0.060