PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-18:42:40
G07     31.0           69.5               13.6 +/-    1.09      14.4 +/-    1.09  0.040 / 0.070
G08     58.9           47.4               12.6 +/-    0.59      16.4 +/-    0.59  0.040 / 0.070
G09     179.5          43.6               17.1 +/-    1.61      23.5 +/-    1.61  0.090 / 0.150
G11     126.5          30.9               15.7 +/-    0.95      26.9 +/-    0.95  0.080 / 0.160
G18     110.2          13.2               14.7 +/-    2.25      38.2 +/-    2.25  0.040 / 0.050
G27     38.3           12.1                9.8 +/-    2.19      26.0 +/-    2.19  0.040 / 0.040
G28     267.1          49.5               14.6 +/-    1.02      18.5 +/-    1.02  0.030 / 0.040
G30     327.7          56.5               12.4 +/-    1.05      14.6 +/-    1.05  0.030 / 0.050