PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-19:27:50
G01     67.5           32.5                9.8 +/-    1.63      16.4 +/-    1.63  0.110 / 0.260
G07     139.1          28.8               13.7 +/-    1.10      24.5 +/-    1.10  0.090 / 0.240
G11     52.3           29.4                9.7 +/-    1.87      17.2 +/-    1.87  0.030 / 0.040
G13     271.0          37.0               13.6 +/-    2.39      20.8 +/-    2.39  0.040 / 0.030
G15     300.5          15.5                8.2 +/-    2.07      20.2 +/-    2.07  0.140 / 0.200
G17     237.3          68.4               13.8 +/-    0.64      14.7 +/-    0.64  0.160 / 0.260
G18     47.1           17.0                8.8 +/-    1.80      20.9 +/-    1.80  0.060 / 0.090
G19     226.4          43.1               14.6 +/-    2.11      20.2 +/-    2.11  0.070 / 0.110
G28     25.0           58.5                9.8 +/-    1.97      11.3 +/-    1.97  0.030 / 0.040
G30     138.3          58.2               12.1 +/-    0.36      14.0 +/-    0.36  0.040 / 0.040