PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-19:58:00
G01     102.4          27.9               16.2 +/-    1.19      29.7 +/-    1.19  0.030 / 0.030
G07     113.2          55.2               15.9 +/-    0.69      18.9 +/-    0.69  0.040 / 0.030
G08     42.0           19.6               10.7 +/-    1.42      23.8 +/-    1.42  0.120 / 0.190
G11     84.4           43.2               15.9 +/-    0.85      22.0 +/-    0.85  0.070 / 0.100
G13     306.0          31.1               13.3 +/-    1.42      22.8 +/-    1.42  0.040 / 0.050
G17     209.0          38.4               19.9 +/-    1.29      29.8 +/-    1.29  0.050 / 0.050
G18     75.9           24.8               14.5 +/-    1.30      28.5 +/-    1.30  0.070 / 0.120
G19     210.6          16.2               -1.8 +/-   10.75      -4.4 +/-   10.75  0.070 / 0.140
G28     327.9          61.6               14.0 +/-    0.64      15.7 +/-    0.64  0.020 / 0.040
G30     56.4           79.2               14.9 +/-    0.57      15.1 +/-    0.57  0.020 / 0.050