PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-12:58:00
G01     235.3          26.1                6.8 +/-    1.09      12.9 +/-    1.09  0.140 / 0.130
G03     305.3          63.9                5.8 +/-    0.69       6.4 +/-    0.69  0.120 / 0.150
G14     75.3           31.2                6.5 +/-    1.49      11.2 +/-    1.49  0.040 / 0.040
G16     158.4          30.2                8.1 +/-    2.12      14.2 +/-    2.12  0.040 / 0.030
G18     208.9          14.9                5.7 +/-    2.67      14.3 +/-    2.67  0.030 / 0.030
G22     242.1          77.1                6.7 +/-    0.31       6.9 +/-    0.31  0.040 / 0.030
G23     298.1          29.1                4.9 +/-    1.70       8.7 +/-    1.70  0.090 / 0.140
G26     123.0          48.8                8.5 +/-    0.71      10.9 +/-    0.71  0.080 / 0.130
G31     41.6           44.2                5.9 +/-    0.91       8.1 +/-    0.91  0.120 / 0.180
G32     87.5           17.8                5.9 +/-    1.56      13.8 +/-    1.56  0.080 / 0.190