PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-20:13:10
G01     76.9           32.9               14.1 +/-    0.44      23.3 +/-    0.44  0.040 / 0.060
G07     133.9          29.9               15.8 +/-    1.03      27.7 +/-    1.03  0.040 / 0.060
G11     56.7           33.8               12.3 +/-    0.39      20.0 +/-    0.39  0.050 / 0.100
G13     280.7          38.6               15.3 +/-    1.33      22.7 +/-    1.33  0.050 / 0.120
G15     306.5          14.3               10.8 +/-    2.11      27.4 +/-    2.11  0.030 / 0.040
G17     223.8          64.8               16.9 +/-    1.24      18.5 +/-    1.24  0.030 / 0.040
G18     51.7           19.4               12.0 +/-    0.90      26.8 +/-    0.90  0.080 / 0.100
G19     219.7          37.2               16.3 +/-    1.19      24.8 +/-    1.19  0.090 / 0.120
G28     0.3            61.3               12.2 +/-    0.51      13.7 +/-    0.51  0.070 / 0.270
G30     129.1          65.4               15.7 +/-    0.69      17.1 +/-    0.69  0.080 / 0.250