J, H and K-band absolute magnitude as a function of IR spectral type. Labeled objects are those with new parallaxes presented here. Blue squared points are known to be unresolved binaries, while green squared points are possible unresolved binaries. The over plotted lines are polynomial fit by Liu et al. (2006) based on data tabulated by Knapp et al. (2004). The dotted line was obtained excluding all the known and possible binaries, the dashed one excluding only the known binaries. The red lines are our new polynomial fits.