PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-13:28:10
G10     290.4          49.0                3.6 +/-    3.56       4.6 +/-    3.56  0.050 / 0.080
G15     46.7           30.7                2.8 +/-    0.93       4.8 +/-    0.93  0.040 / 0.090
G20     66.3           25.3                3.4 +/-    1.43       6.5 +/-    1.43  0.080 / 0.120
G21     87.7           74.0                4.2 +/-    0.40       4.4 +/-    0.40  0.080 / 0.130
G24     103.3          24.6                7.9 +/-    1.20      15.6 +/-    1.20  0.080 / 0.120
G27     304.1          32.8                2.4 +/-    2.48       4.0 +/-    2.48  0.080 / 0.130
G29     167.5          9.9                 3.9 +/-    2.39      11.0 +/-    2.39  0.040 / 0.040
G32     209.0          27.9                3.3 +/-    1.49       6.0 +/-    1.49  0.050 / 0.040