PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-05:28:00
G10     255.2          31.4                8.8 +/-    0.96      14.9 +/-    0.96  0.040 / 0.040
G13     48.9           26.0                5.4 +/-    1.80      10.3 +/-    1.80  0.040 / 0.030
G15     74.6           55.0                6.2 +/-    1.08       7.3 +/-    1.08  0.130 / 0.170
G16     294.3          14.1                4.0 +/-    1.73      10.2 +/-    1.73  0.150 / 0.110
G20     277.6          54.2                7.3 +/-    3.24       8.8 +/-    3.24  0.090 / 0.130
G21     343.9          64.6                5.1 +/-    0.72       5.6 +/-    0.72  0.100 / 0.200
G26     266.0          13.3                5.3 +/-    3.11      13.6 +/-    3.11  0.040 / 0.070
G29     163.1          40.4                7.5 +/-    0.91      10.9 +/-    0.91  0.040 / 0.070