PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-13:28:00
G07     22.9           67.7                6.9 +/-    0.43       7.4 +/-    0.43  0.270 / 0.110
G08     63.0           47.0                5.7 +/-    0.94       7.5 +/-    0.94  0.050 / 0.060
G09     178.1          49.5                8.5 +/-    0.73      10.8 +/-    0.73  0.040 / 0.070
G11     128.0          26.1                6.1 +/-    1.71      11.7 +/-    1.71  0.030 / 0.030
G23     160.3          22.0                6.5 +/-    0.76      13.6 +/-    0.76  0.250 / 0.270
G27     40.7           17.1                6.3 +/-    1.97      14.8 +/-    1.97  0.140 / 0.210
G28     257.9          44.7                6.4 +/-    3.06       8.6 +/-    3.06  0.090 / 0.080
G30     317.3          47.4                5.6 +/-    1.28       7.3 +/-    1.28  0.050 / 0.050