PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-19:58:00
G01     85.9           32.2               14.3 +/-    0.78      24.0 +/-    0.78  0.050 / 0.080
G07     128.8          36.5               15.9 +/-    0.59      24.6 +/-    0.59  0.040 / 0.080
G11     63.6           38.0               13.2 +/-    1.39      19.9 +/-    1.39  0.040 / 0.050
G13     290.2          37.7               16.4 +/-    2.58      24.8 +/-    2.58  0.040 / 0.050
G15     312.5          11.8               11.3 +/-    1.64      30.2 +/-    1.64  0.030 / 0.030
G17     215.9          57.4               17.0 +/-    1.16      19.8 +/-    1.16  0.030 / 0.030
G18     58.5           22.0               11.5 +/-    2.25      24.0 +/-    2.25  0.070 / 0.120
G19     215.4          30.2               15.9 +/-    2.91      27.7 +/-    2.91  0.060 / 0.100
G28     345.6          61.7               13.4 +/-    0.66      15.0 +/-    0.66  0.110 / 0.160
G30     115.7          72.1               15.0 +/-    0.79      15.6 +/-    0.79  0.130 / 0.200