PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-23:57:40
G02     276.9          81.1               11.5 +/-    0.61      11.6 +/-    0.61  0.070 / 0.120
G05     168.1          23.0               18.6 +/-    2.28      38.0 +/-    2.28  0.070 / 0.130
G06     38.9           54.1               10.7 +/-    0.58      12.9 +/-    0.58  0.050 / 0.040
G12     320.2          56.2               10.6 +/-    1.07      12.5 +/-    1.07  0.060 / 0.060
G17     76.6           17.6               10.3 +/-    1.10      24.0 +/-    1.10  0.110 / 0.240
G19     63.9           33.8               10.7 +/-    0.54      17.4 +/-    0.54  0.100 / 0.240
G24     237.0          30.2               14.4 +/-    0.78      25.1 +/-    0.78  0.040 / 0.030
G25     317.3          18.9                9.8 +/-    2.48      22.1 +/-    2.48  0.040 / 0.040