Lower left: the distribution of heliocentric distance (R) versus ﹩g^{\prime} ﹩-band absolute magnitude (H_g) of the detected JT asteroids. The uncertainty of the estimated heliocentric distances is ∼0.11 au, which causes the H_g errors of ∼0.1 mag as the primary factor for most objects. The filled circles are the objects with R < 5.6 au and H_g < 16.9 mag (separated by the dashed lines) defined as the unbiased sample. The detection limit of our data, namely the apparent magnitude of m_g = 23.9 mag, is indicated by the dotted line. Upper left and lower right: the R and H_g histograms of the full sample (open bars) and the unbiased sample (solid bars), respectively.