PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-20:58:00
G01     85.8           32.7               10.9 +/-    2.02      18.0 +/-    2.02  0.140 / 0.170
G07     128.7          42.7               14.0 +/-    0.60      19.5 +/-    0.60  0.130 / 0.200
G11     66.1           39.2               11.4 +/-    0.82      16.8 +/-    0.82  0.200 / 0.300
G13     290.6          36.7               12.3 +/-    1.83      18.9 +/-    1.83  0.160 / 0.350
G15     312.7          11.6                6.2 +/-   16.91      16.7 +/-   16.91  0.060 / 0.090
G17     218.2          52.4               13.4 +/-    1.32      16.5 +/-    1.32  0.070 / 0.100
G18     60.6           23.3               10.2 +/-    1.26      20.8 +/-    1.26  0.040 / 0.060
G19     216.5          29.7               14.3 +/-    1.96      25.3 +/-    1.96  0.030 / 0.060
G28     357.3          61.4               11.6 +/-    1.05      13.0 +/-    1.05  0.050 / 0.040
G30     116.6          71.4               12.1 +/-    1.12      12.7 +/-    1.12  0.040 / 0.040