PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-21:27:50
G01     54.9           28.4               12.2 +/-    2.19      22.0 +/-    2.19  0.040 / 0.060
G07     144.5          17.9               16.6 +/-    1.24      38.5 +/-    1.24  0.050 / 0.050
G11     46.7           20.7               11.5 +/-    2.16      24.8 +/-    2.16  0.100 / 0.250
G13     256.7          33.0               15.1 +/-    2.41      24.9 +/-    2.41  0.110 / 0.250
G15     288.9          16.3               12.8 +/-    1.16      30.8 +/-    1.16  0.040 / 0.040
G17     269.4          75.5               15.7 +/-    1.03      16.2 +/-    1.03  0.060 / 0.050
G18     39.6           9.8                 8.8 +/-    3.77      24.7 +/-    3.77  0.090 / 0.570
G19     238.7          54.4               16.8 +/-    2.48      20.1 +/-    2.48  0.100 / 0.480
G28     44.8           54.7               12.7 +/-    1.13      15.2 +/-    1.13  0.090 / 0.150
G30     146.6          45.4               16.3 +/-    0.40      21.8 +/-    0.40  0.080 / 0.140