Fig. 1
Representative proper-motion diagram of all PPMXL sources brighter than J = 15.5 mag in a 30 arcmin-radius circular area centred on LP 648–20. The red square box in the bottom left indicates the proper-motion search area around LP 648–20, marked with a filled circle. The open circle corresponds to the bright, young G5 V star EX Cet.
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