PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-20:12:50
G01     106.9          25.7               14.8 +/-    2.69      28.6 +/-    2.69  0.130 / 0.150
G07     106.8          58.6               16.5 +/-    0.99      19.0 +/-    0.99  0.200 / 0.160
G08     42.4           23.6               11.6 +/-    1.81      23.4 +/-    1.81  0.170 / 0.210
G09     175.3          14.0               19.2 +/-    2.28      48.8 +/-    2.28  0.200 / 0.190
G11     90.9           43.2               15.4 +/-    0.87      21.3 +/-    0.87  0.360 / 0.210
G13     309.7          28.4               12.4 +/-    1.08      22.4 +/-    1.08  0.220 / 0.180
G17     207.2          33.6               17.8 +/-    1.12      29.1 +/-    1.12  0.040 / 0.030
G18     80.8           24.4               16.0 +/-    1.16      31.7 +/-    1.16  0.040 / 0.040
G28     319.0          61.1               13.3 +/-    0.79      14.9 +/-    0.79  0.050 / 0.060
G30     33.7           78.3               16.4 +/-    1.04      16.7 +/-    1.04  0.040 / 0.050