PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-20:57:50
G10     270.2          40.2               10.5 +/-    1.29      15.2 +/-    1.29  0.180 / 0.270
G13     40.6           15.9                7.3 +/-    2.00      17.8 +/-    2.00  0.160 / 0.250
G15     59.9           51.4                8.4 +/-    0.65      10.4 +/-    0.65  0.050 / 0.040
G16     275.8          11.2                7.3 +/-    3.38      19.9 +/-    3.38  0.040 / 0.040
G20     303.1          61.5                7.7 +/-    0.75       8.7 +/-    0.75  0.140 / 0.700
G21     10.8           73.5                9.0 +/-    1.09       9.3 +/-    1.09  0.210 / 0.640
G24     115.5          16.1                9.7 +/-    1.07      23.6 +/-    1.07  0.130 / 0.420
G27     317.8          20.1                8.1 +/-    1.54      17.7 +/-    1.54  0.120 / 0.460
G29     168.3          28.7               11.1 +/-    1.02      20.0 +/-    1.02  0.130 / 0.190
G32     204.4          12.6                9.4 +/-    2.27      24.7 +/-    2.27  0.130 / 0.190