PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/01-20:58:10
G01     121.7          16.1               15.8 +/-    1.68      38.2 +/-    1.68  0.100 / 0.220
G07     71.5           68.1               12.2 +/-    0.74      13.1 +/-    0.74  0.100 / 0.250
G08     48.0           38.2               11.0 +/-    0.64      16.5 +/-    0.64  0.080 / 0.220
G09     178.0          29.8               15.3 +/-    0.98      26.9 +/-    0.98  0.090 / 0.220
G11     113.4          38.5               14.7 +/-    0.98      22.0 +/-    0.98  0.050 / 0.060
G13     319.2          16.6               11.4 +/-    1.79      27.2 +/-    1.79  0.040 / 0.060
G17     202.3          18.2               19.0 +/-    2.02      43.8 +/-    2.02  0.030 / 0.040
G18     97.9           19.6               14.1 +/-    1.25      31.3 +/-    1.25  0.030 / 0.040
G28     288.2          56.4               13.6 +/-    0.81      15.9 +/-    0.81  0.070 / 0.100
G30     347.1          67.9               10.9 +/-    0.80      11.7 +/-    0.80  0.060 / 0.120