PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-13:27:30
G01     94.1           30.6                8.2 +/-    1.19      14.2 +/-    1.19  0.040 / 0.040
G07     122.4          45.6                8.9 +/-    0.99      11.9 +/-    0.99  0.040 / 0.040
G11     71.2           38.7                7.6 +/-    1.20      11.3 +/-    1.20  0.070 / 0.160
G13     300.6          33.2                3.7 +/-    1.35       6.1 +/-    1.35  0.070 / 0.110
G17     211.5          52.6                9.5 +/-    0.84      11.7 +/-    0.84  0.030 / 0.020
G19     212.8          25.5                8.4 +/-    1.66      16.3 +/-    1.66  0.030 / 0.020
G28     342.2          61.7                6.8 +/-    0.69       7.6 +/-    0.69  0.040 / 0.040
G30     78.7           79.5                7.4 +/-    0.88       7.5 +/-    0.88  0.030 / 0.040