PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-08:57:40
G05     48.6           16.8                2.2 +/-    1.51       5.2 +/-    1.51  0.040 / 0.050
G10     235.7          12.8                1.2 +/-   19.75       3.1 +/-   19.75  0.040 / 0.050
G13     76.0           35.8                6.8 +/-    0.93      10.7 +/-    0.93  0.050 / 0.090
G15     124.1          52.1                6.9 +/-    0.67       8.5 +/-    0.67  0.070 / 0.090
G20     247.8          36.8                7.1 +/-    1.48      10.9 +/-    1.48  0.170 / 0.170
G21     317.2          50.3                4.3 +/-    0.97       5.4 +/-    0.97  0.120 / 0.360
G26     293.5          18.3                3.6 +/-    0.54       8.3 +/-    0.54  0.040 / 0.030
G29     150.3          68.2                7.9 +/-    0.39       8.4 +/-    0.39  0.030 / 0.030