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Fig. 3

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Visibilities, averaged over 2 km s-1 around the systemic velocity, obtained for IK Tau and TX Cam using the Owens Valley Millimeter Array (Marvel 2005). The observations are overlaid by model results using various abundance distributions. Top panel – for TX Cam the following models are shown: f0  =  1.1 × 10-6 and re  =  1.2 × 1016 cm (dotted line), f0  =  7.0 × 10-7 and re  =  1.6 × 1016 cm (solid line), and f0  =  5.0 × 10-7 and re  =  2.0 × 1016 cm (dashed line). Bottom panel – for IK Tau the following models are shown: f0  =  1.0 × 10-6 and re  =  6.0 × 1015 cm (dotted line), f0  =  5.0 × 10-7 and re  =  9.0 × 1015 cm (solid line), and f0  =  3.0 × 10-7 and re  =  1.2 × 1016 cm (dashed line).

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