PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/15-06:57:20
G10     274.5          43.1                5.5 +/-    1.51       7.6 +/-    1.51  0.030 / 0.020
G13     39.1           12.6                3.8 +/-    3.29       9.9 +/-    3.29  0.040 / 0.030
G15     52.8           42.5                4.9 +/-    1.04       6.8 +/-    1.04  0.160 / 0.290
G20     311.2          62.8                4.9 +/-    0.63       5.4 +/-    0.63  0.110 / 0.310
G21     30.3           75.3                4.3 +/-    0.57       4.5 +/-    0.57  0.060 / 0.060
G24     114.0          18.0                5.3 +/-    1.57      12.3 +/-    1.57  0.080 / 0.060
G27     316.4          22.3                3.3 +/-    0.99       6.9 +/-    0.99  0.140 / 0.140
G29     165.9          20.7                5.7 +/-    1.16      12.3 +/-    1.16  0.130 / 0.120