PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-18:42:30
G07     346.7          62.5               13.5 +/-    0.51      15.0 +/-    0.51  0.040 / 0.020
G08     89.3           54.4               12.8 +/-    0.51      15.4 +/-    0.51  0.050 / 0.020
G09     184.7          64.4               13.8 +/-    0.69      15.1 +/-    0.69  0.060 / 0.130
G11     141.3          18.5               14.9 +/-    1.59      34.0 +/-    1.59  0.070 / 0.120
G23     156.6          28.1               14.0 +/-    1.12      25.5 +/-    1.12  0.040 / 0.010
G27     47.2           25.9                9.6 +/-    1.45      18.4 +/-    1.45  0.040 / 0.020
G28     245.5          36.9               15.2 +/-    1.50      23.3 +/-    1.50  0.060 / 0.030
G30     310.6          42.8               12.9 +/-    1.26      17.9 +/-    1.26  0.070 / 0.050