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Caption: Figure 4.
These plots show the χ2 maps for three Gaussian distribution simulations, with the same mean and standard deviation as measured for the data set HIP 65426 calibrated with HD 116084. The contour regions show the 1σ, 2σ, and 3σ regions respectively from the lowest χ2 value, similar to Figure 3. At the tops of these plots are the best-fit ΔmF380M contrast value along with the minimum value of χ2 on the map. This minimum χ2 location in the above plots is denoted by “×.” These contrast values approximately overlap with the best-fit contrasts for the HIP 65426 companion fit, and the χ2 surfaces display the same lack of a single, clearly defined low minimum. Together, these factors demonstrate that the fit results for HIP 65426 can be caused by noise alone. This further demonstrates that the statistically insignificant companion signals detected in Figure 3 are likely noise artifacts in the data rather than indicating the existence of an actual companion.
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