Plots of Q2, Q4e (Peak Offset), and Q4f (Power Offset) showing the detection limit in Stokes-V (V′ +) with an α = 10−4.5 for the frequency range 53.5–56.5 MHz. Panels a and b: Q2 after elliptical correction. Panels c and d: Q4b difference of the two beams. Panels e and f: Q4f difference of the two beams. The comparison of the two OFF-beams from Obs #2 can be found in the left column (panels a, c, e) and the comparison of ON-beam (Jupiter) vs. OFF-beam 2 can be found in the right column (panels b, d, f). The dashed lines for panels c–f are the 1, 2, 3 σ statistical limits derived from two different Gaussian distributions (each run 10 000 times). Panels d and f show an excess of ON vs. OFF points at ≥ 3σ statistical significance for signals up to a threshold of 6σ. For comparison, in panels c and e most the excess points are below the 2σ statistical significance level. We find by performing Gaussian simulations that the probability to get by chance a curve like panel e is ~20%, whereas the probability to obtain a curve like panel f is ~10−5.
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