PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-20:58:00
G01     52.6           27.0               11.1 +/-    1.11      20.7 +/-    1.11  0.050 / 0.080
G06     179.9          19.3               17.0 +/-    2.90      38.1 +/-    2.90  0.040 / 0.060
G11     45.0           17.1                9.6 +/-    1.78      22.7 +/-    1.78  0.030 / 0.050
G13     253.2          32.7               14.7 +/-    1.85      24.3 +/-    1.85  0.030 / 0.060
G15     286.0          16.3               12.8 +/-    2.14      30.9 +/-    2.14  0.100 / 0.320
G17     298.4          79.5               13.9 +/-    0.91      14.1 +/-    0.91  0.110 / 0.290
G19     240.8          57.4               15.5 +/-    0.47      18.0 +/-    0.47  0.060 / 0.120
G28     40.6           56.7               11.9 +/-    0.61      14.0 +/-    0.61  0.060 / 0.110
G30     147.7          43.2               14.8 +/-    0.95      20.5 +/-    0.95  0.060 / 0.150