PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-06:58:00
G10     256.1          30.8                5.6 +/-    1.53       9.6 +/-    1.53  0.040 / 0.040
G13     48.6           26.5                4.2 +/-    2.50       7.9 +/-    2.50  0.040 / 0.040
G15     73.5           54.9                4.8 +/-    0.43       5.7 +/-    0.43  0.110 / 0.330
G16     289.2          14.8                1.8 +/-    2.47       4.5 +/-    2.47  0.130 / 0.370
G20     4.7            68.4                4.1 +/-    0.48       4.4 +/-    0.48  0.260 / 0.170
G21     342.4          64.7                4.8 +/-    0.45       5.3 +/-    0.45  0.050 / 0.060
G26     261.0          12.9                3.9 +/-    1.80      10.2 +/-    1.80  0.050 / 0.060
G27     322.0          10.6              -11.2 +/-   18.83     -30.8 +/-   18.83  0.040 / 0.030
G29     166.4          43.0                5.0 +/-    0.65       6.9 +/-    0.65  0.040 / 0.040