The brightness error of an observation represents the error in the brightness value (e.g., magnitude estimate). It is visually represented as a 'vertical bar' centered around  the corresponding brightness dot in the light curve. The bar extends above and below the observation by the amount of the error. For example, if the brightness error is 0.1 mag, the total bar height is 0.2 mag, indicating the value is meant to be taken as +/- the amount. Brightness error values are taken into account when performing a period analysis calculation in certain Peranso period analysis methods (e.g., the FALC method).

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Observations of exoplanet Tres-1b by Tonny Vanmunster, CBA Belgium Observatory, showing gray colored magnitude error bars