PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-13:58:00
G01     120.9          16.3                9.7 +/-    1.73      23.5 +/-    1.73  0.090 / 0.140
G07     79.9           64.7                9.3 +/-    0.63      10.2 +/-    0.63  0.090 / 0.140
G08     45.6           31.8                7.0 +/-    0.95      11.8 +/-    0.95  0.030 / 0.030
G09     176.0          27.1                7.4 +/-    1.34      13.9 +/-    1.34  0.030 / 0.030
G11     106.5          37.4                9.5 +/-    0.85      14.4 +/-    0.85  0.030 / 0.030
G13     319.6          15.7                5.5 +/-    2.93      13.3 +/-    2.93  0.040 / 0.020
G17     200.4          24.4                7.5 +/-    3.26      14.9 +/-    3.26  0.100 / 0.310
G28     288.6          56.2                8.5 +/-    1.26      10.0 +/-    1.26  0.200 / 0.280
G30     338.9          64.4                9.3 +/-    0.84      10.2 +/-    0.84  0.180 / 0.240