PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-00:42:40
G01     96.9           30.0                9.5 +/-    1.26      16.7 +/-    1.26  0.030 / 0.050
G07     119.5          50.8                9.3 +/-    0.93      11.7 +/-    0.93  0.030 / 0.040
G08     42.0           14.4                5.9 +/-    3.00      14.8 +/-    3.00  0.190 / 0.360
G11     79.3           43.0                9.0 +/-    0.95      12.5 +/-    0.95  0.290 / 0.250
G13     301.6          33.2                5.4 +/-    1.75       8.9 +/-    1.75  0.050 / 0.050
G17     211.1          46.1               10.0 +/-    0.91      13.3 +/-    0.91  0.040 / 0.050
G19     212.2          22.0               10.0 +/-    2.02      21.0 +/-    2.02  0.080 / 0.100
G28     338.9          61.9                6.4 +/-    0.69       7.2 +/-    0.69  0.080 / 0.080
G30     92.2           75.7                8.8 +/-    0.59       9.0 +/-    0.59  0.050 / 0.120