PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-16:28:00
G07     346.8          62.5                9.1 +/-    0.56      10.1 +/-    0.56  0.040 / 0.040
G08     86.4           53.6                9.7 +/-    0.69      11.7 +/-    0.69  0.050 / 0.040
G09     183.6          63.8               10.6 +/-    0.75      11.7 +/-    0.75  0.080 / 0.060
G11     140.5          18.8               11.8 +/-    2.00      26.6 +/-    2.00  0.080 / 0.060
G23     156.6          28.2               11.8 +/-    1.06      21.5 +/-    1.06  0.040 / 0.030
G27     47.4           26.1                7.7 +/-    1.57      14.6 +/-    1.57  0.030 / 0.030
G28     245.3          36.7               12.4 +/-    1.47      19.1 +/-    1.47  0.110 / 0.100
G30     309.8          41.9                8.9 +/-    1.42      12.6 +/-    1.42  0.090 / 0.100