PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-12:12:50
G01     256.2          38.3                7.1 +/-    1.49      10.6 +/-    1.49  0.060 / 0.090
G03     317.0          44.6                4.6 +/-    0.66       6.2 +/-    0.66  0.060 / 0.080
G11     240.5          14.2                4.0 +/-    2.14      10.0 +/-    2.14  0.070 / 0.090
G14     55.2           43.3                4.4 +/-    1.85       6.1 +/-    1.85  0.060 / 0.100
G18     222.2          30.7                4.7 +/-    2.18       8.1 +/-    2.18  0.050 / 0.040
G22     308.0          66.5                5.9 +/-    0.96       6.4 +/-    0.96  0.050 / 0.040
G25     43.3           12.0                3.9 +/-    0.79      10.4 +/-    0.79  0.050 / 0.100
G26     143.6          32.7                4.5 +/-    0.86       7.5 +/-    0.86  0.050 / 0.090
G31     43.6           64.5                3.0 +/-    0.39       3.2 +/-    0.39  0.070 / 0.080
G32     70.2           30.2                5.5 +/-    1.37       9.6 +/-    1.37  0.080 / 0.100