@property<EOL><INDENT>def y0(self):<DEDENT>
try:<EOL><INDENT>return self._y0<EOL><DEDENT>except AttributeError:<EOL><INDENT>self._y0 = Quantity(<NUM_LIT:0>, self.yunit)<EOL>return self._y0<EOL><DEDENT>
Y-axis coordinate of the first data point

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