We present the first spatially resolved observations of a sample of 23 Mira stars simultaneously measured in the near-infrared J, H and K bands. The technique used was optical long baseline interferometry, and we present for each star visibility amplitude measurements as a function of wavelength. We also present characteristic sizes at each spectral band, obtained by fitting the measured visibilities to a simple uniform disk model. This approach reveals the general relation J diameter < H diameter < K diameter.
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