PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-19:27:50
G01     99.7           28.4               13.3 +/-    0.97      24.1 +/-    0.97  0.050 / 0.050
G07     118.1          46.8               13.5 +/-    0.90      17.7 +/-    0.90  0.050 / 0.050
G08     41.5           14.2                9.1 +/-    1.64      23.1 +/-    1.64  0.030 / 0.030
G11     78.1           42.3               12.3 +/-    0.92      17.3 +/-    0.92  0.030 / 0.020
G13     303.5          33.2               11.0 +/-    2.24      18.1 +/-    2.24  0.040 / 0.050
G17     207.9          45.1               14.6 +/-    0.86      19.7 +/-    0.86  0.040 / 0.050
G18     70.9           24.0               11.4 +/-    1.66      22.8 +/-    1.66  0.080 / 0.150
G19     210.4          19.2                2.7 +/-   17.44       6.0 +/-   17.44  0.090 / 0.140
G28     321.6          60.6               11.3 +/-    0.44      12.8 +/-    0.44  0.070 / 0.130
G30     68.8           79.1               12.6 +/-    0.77      12.9 +/-    0.77  0.080 / 0.110