PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/29-21:27:50
G02     199.8          19.0               23.7 +/-    1.47      53.4 +/-    1.47  0.080 / 0.140
G06     173.8          49.4               16.6 +/-    1.24      21.1 +/-    1.24  0.080 / 0.140
G13     227.8          14.8               22.8 +/-    4.02      57.0 +/-    4.02  0.040 / 0.070
G17     20.0           61.2               12.6 +/-    0.55      14.2 +/-    0.55  0.040 / 0.080
G19     316.1          71.6               13.3 +/-    0.61      13.9 +/-    0.61  0.100 / 0.270
G24     310.7          28.8               10.8 +/-    0.87      19.5 +/-    0.87  0.110 / 0.260
G28     81.9           44.6               12.5 +/-    1.05      16.9 +/-    1.05  0.050 / 0.060
G30     156.2          14.9               19.1 +/-    1.85      47.8 +/-    1.85  0.040 / 0.070