PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/17-22:12:50
G02     199.5          17.3               17.1 +/-    1.89      40.2 +/-    1.89  0.100 / 0.130
G06     174.9          46.8               14.1 +/-    1.74      18.5 +/-    1.74  0.080 / 0.100
G13     229.2          16.0               16.7 +/-    2.38      40.5 +/-    2.38  0.040 / 0.040
G17     18.3           62.4               12.1 +/-    1.15      13.5 +/-    1.15  0.040 / 0.030
G19     308.9          71.6               11.6 +/-    0.67      12.2 +/-    0.67  0.040 / 0.080
G24     311.7          27.7                7.6 +/-    1.60      13.9 +/-    1.60  0.050 / 0.070
G28     79.7           45.4                8.9 +/-    1.37      11.9 +/-    1.37  0.280 / 0.320
G30     156.1          17.0               13.3 +/-    2.54      31.4 +/-    2.54  0.300 / 0.270