PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-16:57:30
G07     357.2          64.4                9.4 +/-    0.66      10.3 +/-    0.66  0.050 / 0.100
G08     86.8           52.2                8.2 +/-    1.10      10.1 +/-    1.10  0.060 / 0.090
G09     187.1          67.9                8.9 +/-    0.57       9.5 +/-    0.57  0.030 / 0.040
G11     140.4          18.3                9.7 +/-    1.34      22.1 +/-    1.34  0.040 / 0.030
G23     157.4          34.7                9.0 +/-    1.00      14.3 +/-    1.00  0.090 / 0.140
G27     50.6           29.2                8.7 +/-    1.36      15.5 +/-    1.36  0.120 / 0.200
G28     240.9          30.3                9.8 +/-    1.36      17.0 +/-    1.36  0.080 / 0.120
G30     308.4          41.2                8.1 +/-    1.28      11.6 +/-    1.28  0.090 / 0.120