@property<EOL><INDENT>def yindex(self):<DEDENT>
try:<EOL><INDENT>return self._yindex<EOL><DEDENT>except AttributeError:<EOL><INDENT>self._yindex = Index.define(self.y0, self.dy, self.shape[<NUM_LIT:1>])<EOL>return self._yindex<EOL><DEDENT>
Positions of the data on the y-axis

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