PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/23-19:58:00
G02     256.4          78.4                9.6 +/-    0.34       9.8 +/-    0.34  0.110 / 0.320
G05     169.7          20.0               12.9 +/-    0.91      28.4 +/-    0.91  0.120 / 0.360
G06     39.6           54.8                9.4 +/-    0.69      11.2 +/-    0.69  0.030 / 0.030
G12     320.8          53.9                8.5 +/-    1.30      10.3 +/-    1.30  0.030 / 0.040
G17     73.0           21.2                8.9 +/-    1.41      19.0 +/-    1.41  0.110 / 0.110
G19     61.4           35.0                8.4 +/-    1.24      13.3 +/-    1.24  0.080 / 0.150
G24     241.1          32.2                9.6 +/-    0.97      16.0 +/-    0.97  0.030 / 0.040
G25     316.9          15.1                6.4 +/-    2.27      15.8 +/-    2.27  0.040 / 0.050