Shift lammps coordinate lower limit to 0

package/MDAnalysis/topology/LAMMPSParser.py

@@ -325,14 +325,16 @@ def read_DATA_timestep(self, n_atoms, TS_class, TS_kwargs,
 
         header, sects = self.grab_datafile()
 
-        unitcell = self._parse_box(header)
-
         try:
             positions, ordering = self._parse_pos(sects['Atoms'])
         except KeyError as err:
             errmsg = f"Position information not found: {err}"
             raise IOError(errmsg) from None
 
+        unitcell, lo = self._parse_box(header)
+        # Shift lower limit coordinates to 0
+        positions -= np.array(lo)
+
         if 'Velocities' in sects:
             velocities = self._parse_vel(sects['Velocities'], ordering)
         else:
@@ -580,7 +582,7 @@ def _parse_box(self, header):
             unitcell[:3] = x, y, z
             unitcell[3:] = 90., 90., 90.
 
-        return unitcell
+        return unitcell, (x1, y1, z1)
 
 
 class LammpsDumpParser(TopologyReaderBase):