PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-09:27:50
G08     305.6          19.3                5.8 +/-    2.46      13.1 +/-    2.46  0.060 / 0.140
G10     348.5          62.0                2.9 +/-    0.51       3.2 +/-    0.51  0.060 / 0.140
G14     223.4          35.1                6.8 +/-    1.95      10.8 +/-    1.95  0.080 / 0.080
G20     81.8           25.3                4.4 +/-    0.97       8.6 +/-    0.97  0.060 / 0.090
G21     141.3          48.6                6.2 +/-    0.85       7.9 +/-    0.85  0.080 / 0.190
G24     64.6           28.7                2.4 +/-    0.67       4.4 +/-    0.67  0.060 / 0.170
G27     263.4          35.3                6.1 +/-    1.12       9.7 +/-    1.12  0.040 / 0.030
G32     232.9          62.0                8.5 +/-    0.67       9.5 +/-    0.67  0.030 / 0.030