PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-20:27:50
G01     66.9           32.1               12.1 +/-    0.66      20.4 +/-    0.66  0.030 / 0.040
G07     138.5          22.4               14.6 +/-    2.23      30.3 +/-    2.23  0.030 / 0.040
G11     50.8           28.0                9.4 +/-    0.56      17.3 +/-    0.56  0.080 / 0.150
G13     269.8          37.8               15.2 +/-    0.98      22.9 +/-    0.98  0.070 / 0.130
G15     299.1          16.1               11.1 +/-    3.11      26.9 +/-    3.11  0.060 / 0.060
G17     238.7          72.4               14.4 +/-    0.78      15.0 +/-    0.78  0.070 / 0.060
G18     45.1           15.2                9.6 +/-    2.26      23.7 +/-    2.26  0.130 / 0.530
G19     225.8          45.0               15.7 +/-    1.27      21.1 +/-    1.27  0.120 / 0.420
G28     16.2           60.2               12.0 +/-    0.74      13.6 +/-    0.74  0.060 / 0.080
G30     138.4          57.2               13.7 +/-    0.79      16.0 +/-    0.79  0.050 / 0.080