PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-23:43:10
G02     220.1          65.3               13.0 +/-    0.59      14.2 +/-    0.59  0.110 / 0.330
G06     51.7           74.0               10.3 +/-    0.38      10.7 +/-    0.38  0.140 / 0.310
G12     318.7          37.1                9.0 +/-    0.69      13.7 +/-    0.69  0.060 / 0.090
G17     60.9           29.0                9.5 +/-    1.32      17.0 +/-    1.32  0.070 / 0.090
G19     44.0           46.2               10.2 +/-    1.19      13.6 +/-    1.19  0.050 / 0.080
G24     258.2          40.4               12.8 +/-    0.99      18.4 +/-    0.99  0.050 / 0.080
G28     124.1          14.4               14.6 +/-    1.38      36.9 +/-    1.38  0.030 / 0.040