PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/17-08:57:40
G07     35.3           69.4                6.1 +/-    0.79       6.5 +/-    0.79  0.030 / 0.030
G08     54.7           42.6                4.6 +/-    0.99       6.4 +/-    0.99  0.040 / 0.030
G09     174.9          38.4                6.9 +/-    1.01      10.3 +/-    1.01  0.090 / 0.240
G11     123.4          31.8                5.5 +/-    0.67       9.3 +/-    0.67  0.080 / 0.230
G18     108.2          13.5                4.4 +/-    2.57      11.5 +/-    2.57  0.030 / 0.040
G23     160.9          14.4                5.1 +/-    1.78      12.8 +/-    1.78  0.030 / 0.040
G27     38.7           13.3                2.6 +/-    2.25       6.7 +/-    2.25  0.170 / 0.250
G28     266.0          48.6                5.8 +/-    3.41       7.5 +/-    3.41  0.140 / 0.270
G30     324.4          54.1                3.7 +/-    0.50       4.4 +/-    0.50  0.130 / 0.250