PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-16:57:40
G07     33.1           69.6               13.5 +/-    0.71      14.3 +/-    0.71  0.040 / 0.060
G08     57.1           45.8               12.9 +/-    1.03      17.2 +/-    1.03  0.040 / 0.040
G09     178.9          42.4               13.9 +/-    0.81      19.5 +/-    0.81  0.030 / 0.030
G11     125.2          31.5               13.7 +/-    0.95      23.3 +/-    0.95  0.030 / 0.030
G18     109.5          13.6               12.6 +/-    2.11      32.4 +/-    2.11  0.030 / 0.050
G27     38.2           11.7                9.6 +/-    2.76      25.8 +/-    2.76  0.030 / 0.040
G28     267.7          49.7               13.9 +/-    3.45      17.6 +/-    3.45  0.140 / 0.310
G30     327.3          56.2               12.9 +/-    0.68      15.2 +/-    0.68  0.150 / 0.300