PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-16:57:50
G07     1.3            65.1                8.8 +/-    0.38       9.6 +/-    0.38  0.110 / 0.150
G08     83.5           52.1                8.5 +/-    1.40      10.5 +/-    1.40  0.090 / 0.190
G09     185.7          65.9                8.2 +/-    0.45       8.9 +/-    0.45  0.030 / 0.050
G11     139.1          19.6                9.1 +/-    2.77      20.2 +/-    2.77  0.040 / 0.040
G23     157.8          32.8                9.7 +/-    1.20      16.0 +/-    1.20  0.050 / 0.060
G27     49.1           28.0                6.1 +/-    1.72      11.2 +/-    1.72  0.050 / 0.060
G28     242.5          31.7                9.7 +/-    2.26      16.5 +/-    2.26  0.090 / 0.100
G30     310.0          42.6                7.7 +/-    1.08      10.8 +/-    1.08  0.130 / 0.150