PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/18-17:57:50
G03     200.9          49.0               15.4 +/-    1.27      19.6 +/-    1.27  0.180 / 0.270
G07     262.1          18.8               15.0 +/-    1.90      34.0 +/-    1.90  0.190 / 0.270
G09     313.1          32.6               11.3 +/-    1.43      18.7 +/-    1.43  0.070 / 0.110
G16     77.6           63.4               15.8 +/-    0.45      17.4 +/-    0.45  0.060 / 0.070
G22     184.0          33.0               14.3 +/-    0.80      23.6 +/-    0.80  0.040 / 0.040
G23     341.4          67.9               13.7 +/-    0.62      14.7 +/-    0.62  0.040 / 0.030
G27     128.5          15.3               16.1 +/-    2.47      39.7 +/-    2.47  0.030 / 0.060