@property<EOL><INDENT>def dy(self):<DEDENT>
try:<EOL><INDENT>return self._dy<EOL><DEDENT>except AttributeError:<EOL><INDENT>try:<EOL><INDENT>self._yindex<EOL><DEDENT>except AttributeError:<EOL><INDENT>self._dy = Quantity(<NUM_LIT:1>, self.yunit)<EOL><DEDENT>else:<EOL><INDENT>if not self.yindex.regular:<EOL><INDENT>raise AttributeError(<EOL>"<STR_LIT>"<EOL>"<STR_LIT>")<EOL><DEDENT>self._dy = self.yindex[<NUM_LIT:1>] - self.yindex[<NUM_LIT:0>]<EOL><DEDENT>return self._dy<EOL><DEDENT>
Y-axis sample separation

        :type: `~astropy.units.Quantity` scalar