PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/21-13:57:00
G02     45.5           44.0                5.5 +/-    0.94       7.5 +/-    0.94  0.030 / 0.020
G05     113.0          70.7                6.5 +/-    0.55       6.9 +/-    0.55  0.030 / 0.020
G12     185.7          50.2                8.1 +/-    0.50      10.2 +/-    0.50  0.040 / 0.060
G25     270.9          58.2               10.3 +/-    1.28      11.9 +/-    1.28  0.030 / 0.050
G29     316.5          38.2                6.2 +/-    0.82       9.2 +/-    0.82  0.040 / 0.050