Maps of the dust emissivity index β_1−3mm. Only pixels with a 2σ detection at both wavelengths are shown. The contours indicate the 94 GHz emission detected at 3, 5, 10, 30, and 80σ. The blue and red arrows indicate the direction of the bipolar jets. The insets show how β_1−3mm evolves as values get integrated to larger and larger scales. The x-axis of the inset plots is labeled in astronomical units.