PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-18:28:00
G07     27.4           69.3                9.5 +/-    0.68      10.1 +/-    0.68  0.050 / 0.050
G08     60.3           48.0                9.4 +/-    0.80      12.1 +/-    0.80  0.040 / 0.050
G09     179.6          44.9               12.3 +/-    0.70      16.5 +/-    0.70  0.330 / 0.650
G11     127.5          30.2               12.4 +/-    1.86      21.6 +/-    1.86  0.220 / 0.540
G18     111.2          12.6               12.4 +/-    1.92      32.6 +/-    1.92  0.160 / 0.350
G23     158.6          10.5               13.7 +/-    4.13      37.8 +/-    4.13  0.140 / 0.330
G27     38.7           13.1                8.0 +/-    2.19      20.8 +/-    2.19  0.030 / 0.030
G28     265.4          48.7               11.2 +/-    4.38      14.3 +/-    4.38  0.030 / 0.030
G30     326.3          55.4                8.7 +/-    0.61      10.3 +/-    0.61  0.040 / 0.050