PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/22-18:42:40
G07     6.1            66.8               12.6 +/-    0.36      13.6 +/-    0.36  0.050 / 0.060
G08     72.2           52.5               13.1 +/-    0.42      16.1 +/-    0.42  0.030 / 0.060
G09     181.2          53.9               14.4 +/-    3.59      17.3 +/-    3.59  0.090 / 0.320
G11     134.5          24.8               16.1 +/-    2.22      31.7 +/-    2.22  0.090 / 0.270
G23     158.1          18.6               13.0 +/-    2.71      29.7 +/-    2.71  0.050 / 0.120
G27     41.8           19.3               10.8 +/-    0.61      24.1 +/-    0.61  0.040 / 0.130
G28     255.3          43.6               11.8 +/-    1.56      16.3 +/-    1.56  0.030 / 0.040
G30     318.7          49.4               11.6 +/-    0.81      14.7 +/-    0.81  0.030 / 0.050