PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-21:27:40
G10     294.4          50.9               10.6 +/-    2.33      13.3 +/-    2.33  0.040 / 0.040
G15     47.4           34.9                8.8 +/-    1.15      14.0 +/-    1.15  0.040 / 0.040
G20     347.0          65.4                9.6 +/-    0.43      10.4 +/-    0.43  0.060 / 0.080
G21     88.8           75.2               10.3 +/-    0.43      10.6 +/-    0.43  0.070 / 0.090
G24     97.0           25.4               10.8 +/-    0.89      20.9 +/-    0.89  0.090 / 0.130
G27     303.8          32.4               10.0 +/-    1.28      16.6 +/-    1.28  0.070 / 0.150
G32     209.4          30.8               13.3 +/-    0.75      22.9 +/-    0.75  0.080 / 0.090