PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-13:57:40
G03     236.4          71.0                9.0 +/-    0.59       9.5 +/-    0.59  0.040 / 0.060
G09     299.9          13.5                6.4 +/-    3.01      16.4 +/-    3.01  0.050 / 0.080
G14     95.7           16.9                9.8 +/-    2.23      23.4 +/-    2.23  0.030 / 0.050
G16     140.7          53.1               10.7 +/-    0.80      13.1 +/-    0.80  0.040 / 0.040
G22     192.2          57.2               10.2 +/-    1.65      11.9 +/-    1.65  0.120 / 0.440
G23     315.5          45.3                7.1 +/-    1.94       9.5 +/-    1.94  0.130 / 0.450
G26     81.5           55.1                8.2 +/-    0.88       9.7 +/-    0.88  0.040 / 0.060
G31     49.7           24.0                7.0 +/-    0.70      14.0 +/-    0.70  0.040 / 0.060