Distribution of the properties of the LQC (orange plus signs), the eight images of the four discoverable known lenses in CatNorth (green cross symbols), and the stellar population located within 3′ of all LQC objects (blue density map). Left : two-dimensional distribution of total PM_SIG (the absolute value of the proper motion divided by its uncertainty) versus PLX_SIG (the absolute value of the parallax divided by its uncertainty). Right : two-dimensional distribution of the W1 - W 2 and z - W1, which is defined in AB magnitude system. We want to note that WISE photometry is calibrated in the Vega system. We converted to AB using m_AB = m_Vega + Δm, with Δm_w1,w2 = (2.699, 3.339), given by Cutri et al. (2013).