PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-16:58:10
G07     18.4           68.5                8.8 +/-    0.56       9.4 +/-    0.56  0.040 / 0.040
G08     63.4           49.1                9.4 +/-    0.78      11.9 +/-    0.78  0.050 / 0.040
G09     179.7          48.1               11.7 +/-    1.27      15.2 +/-    1.27  0.040 / 0.050
G11     129.8          28.2               11.1 +/-    1.64      20.3 +/-    1.64  0.030 / 0.040
G18     113.8          10.9               11.5 +/-    3.97      31.5 +/-    3.97  0.240 / 0.310
G23     158.8          14.3                9.8 +/-    1.23      24.8 +/-    1.23  0.240 / 0.250
G27     39.8           15.8                8.0 +/-    2.08      19.5 +/-    2.08  0.030 / 0.030
G28     261.0          46.6               11.9 +/-    3.58      15.7 +/-    3.58  0.030 / 0.020
G30     322.3          52.3                8.6 +/-    0.75      10.5 +/-    0.75  0.070 / 0.070