PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-08:57:50
G08     269.5          19.2                5.9 +/-    1.54      13.3 +/-    1.54  0.080 / 0.200
G10     58.4           58.3                4.0 +/-    0.91       4.7 +/-    0.91  0.130 / 0.240
G14     262.0          65.6                5.1 +/-    0.54       5.5 +/-    0.54  0.040 / 0.070
G18     313.1          31.7                4.9 +/-    1.92       8.3 +/-    1.92  0.040 / 0.060
G20     93.3           38.0                5.7 +/-    0.50       8.6 +/-    0.50  0.190 / 0.300
G21     154.2          16.4                4.5 +/-    2.03      10.9 +/-    2.03  0.180 / 0.290
G24     40.3           10.7                2.5 +/-    2.09       6.9 +/-    2.09  0.030 / 0.030
G27     234.9          18.0                6.5 +/-    2.40      14.9 +/-    2.40  0.030 / 0.030
G31     179.0          27.5                4.8 +/-    2.16       8.8 +/-    2.16  0.100 / 0.200
G32     310.9          74.7                6.3 +/-    0.61       6.5 +/-    0.61  0.090 / 0.190