PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-17:58:00
G07     353.9          64.3                9.3 +/-    0.72      10.2 +/-    0.72  0.030 / 0.050
G08     81.2           53.7               11.3 +/-    1.29      13.7 +/-    1.29  0.030 / 0.040
G09     182.7          60.0               13.0 +/-    0.36      14.7 +/-    0.36  0.140 / 0.160
G11     138.4          21.1               12.3 +/-    3.17      26.3 +/-    3.17  0.070 / 0.170
G23     157.1          23.7               13.4 +/-    2.11      26.9 +/-    2.11  0.050 / 0.040
G27     44.8           23.4                7.9 +/-    2.31      16.1 +/-    2.31  0.040 / 0.040
G28     249.1          39.6               13.0 +/-    1.36      19.0 +/-    1.36  0.080 / 0.070
G30     313.5          45.1                9.6 +/-    0.75      12.9 +/-    0.75  0.080 / 0.050