PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/28-18:28:00
G03     228.2          67.7               11.9 +/-    0.79      12.8 +/-    0.79  0.090 / 0.080
G09     303.1          17.1                9.9 +/-    2.04      23.5 +/-    2.04  0.090 / 0.070
G14     99.2           16.0               12.3 +/-    2.69      29.8 +/-    2.69  0.130 / 0.320
G16     127.4          59.1               15.1 +/-    0.72      17.3 +/-    0.72  0.130 / 0.280
G22     192.4          54.3               12.8 +/-    0.50      15.3 +/-    0.50  0.180 / 0.310
G23     320.7          50.7               11.8 +/-    0.53      14.8 +/-    0.53  0.350 / 0.180
G26     68.3           51.1               11.5 +/-    1.02      14.3 +/-    1.02  0.030 / 0.040
G31     52.5           18.8               10.7 +/-    2.69      24.3 +/-    2.69  0.030 / 0.040