def dump(self, title, coordinates):
print("<STR_LIT>" % len(self.symbols), file=self._f)<EOL>print(str(title), file=self._f)<EOL>for symbol, coordinate in zip(self.symbols, coordinates):<EOL><INDENT>print("<STR_LIT>" % ((symbol, ) + tuple(coordinate/self.file_unit)), file=self._f)<EOL><DEDENT>
Dump a frame to the trajectory file

           Arguments:
            | ``title``  --  the title of the frame
            | ``coordinates``  --  a numpy array with coordinates in atomic units