PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-21:42:40
G02     200.1          22.1               15.1 +/-    1.83      31.6 +/-    1.83  0.260 / 0.270
G06     173.0          52.7               15.2 +/-    0.66      18.5 +/-    0.66  0.290 / 0.330
G13     225.6          12.7               13.6 +/-   13.87      35.7 +/-   13.87  0.070 / 0.120
G17     23.6           58.7               12.4 +/-    0.75      14.2 +/-    0.75  0.090 / 0.210
G19     326.6          71.0               11.3 +/-    0.46      11.9 +/-    0.46  0.060 / 0.070
G24     308.6          31.1               11.4 +/-    2.66      19.5 +/-    2.66  0.060 / 0.070
G28     85.7           42.8               12.5 +/-    0.87      17.4 +/-    0.87  0.040 / 0.050
G30     156.6          12.1               15.8 +/-    3.11      42.2 +/-    3.11  0.040 / 0.060