Reduced χ² parameters of the modelfit representations of the core region. The top panel shows the resulting values of the 1E, 2C, and 3C Gaussian models normalized to the value of the 1C Gaussian representation. The two horizontal lines mark the limit below which, for the corresponding model, a significant improvement (68% confidence) over 1C is given (0.77, 0.82). Similarly, the middle panel shows the values for 2C and 3C normalized to that of 1E. The horizontal line marks the significant improvement level relative to 2C (0.91). The bottom panel normalizes the χ² values to that of 2C. The dashed line plots the significant improvement limit for 3C (0.86).