PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-13:58:00
G03     236.4          71.0                9.6 +/-    0.48      10.1 +/-    0.48  0.130 / 0.250
G09     299.9          13.5                5.8 +/-    2.02      14.8 +/-    2.02  0.190 / 0.270
G14     95.7           16.9               10.0 +/-    1.82      23.8 +/-    1.82  0.130 / 0.300
G16     140.7          53.1               10.9 +/-    0.36      13.3 +/-    0.36  0.120 / 0.250
G22     192.2          57.2               10.5 +/-    0.73      12.2 +/-    0.73  0.040 / 0.040
G23     315.5          45.3                9.1 +/-    1.34      12.2 +/-    1.34  0.040 / 0.030
G26     81.5           55.1                8.4 +/-    0.80      10.0 +/-    0.80  0.040 / 0.040
G31     49.7           24.0                9.1 +/-    3.07      18.3 +/-    3.07  0.050 / 0.050