Query gaia Dr1,URAT1 and PPMXL with VizieR see http://cdsarc.u-strasbg.fr/doc/asu-summary.htx and http://cds.u-strasbg.fr/doc/asu.html for details , now it's a easy mode Only support for a box region ! Fisrt version 2017/3/20 by vanckyli[at]gmail.com
t=queryVizieR(10.684708,41.232,2,4);
t=t.get_urat1();
disp(t.fields)
summary(t.data);