PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-18:57:30
G07     40.4           69.8               12.7 +/-    1.28      13.4 +/-    1.28  0.040 / 0.060
G08     55.7           45.4               11.2 +/-    0.69      15.0 +/-    0.69  0.040 / 0.070
G09     179.1          40.3               17.2 +/-    1.58      24.8 +/-    1.58  0.060 / 0.080
G11     123.7          32.9               15.0 +/-    0.83      24.8 +/-    0.83  0.050 / 0.090
G18     107.5          14.8               15.2 +/-    2.80      37.9 +/-    2.80  0.030 / 0.040
G28     271.5          51.3               13.4 +/-    1.25      16.7 +/-    1.25  0.040 / 0.040
G30     331.1          59.0               10.9 +/-    0.71      12.5 +/-    0.71  0.080 / 0.120