ScanFieldData of specified field.

        Parameters
        ----------
        well_x : int
        well_y : int
        field_x : int
        field_y : int

        Returns
        -------
        lxml.objectify.ObjectifiedElement
            ScanFieldArray/ScanFieldData element.

def field(self, well_x=1, well_y=1, field_x=1, field_y=1):
        """ScanFieldData of specified field.

        Parameters
        ----------
        well_x : int
        well_y : int
        field_x : int
        field_y : int

        Returns
        -------
        lxml.objectify.ObjectifiedElement
            ScanFieldArray/ScanFieldData element.
        """
        xpath = './ScanFieldArray/ScanFieldData'
        xpath += _xpath_attrib('WellX', well_x)
        xpath += _xpath_attrib('WellY', well_y)
        xpath += _xpath_attrib('FieldX', field_x)
        xpath += _xpath_attrib('FieldY', field_y)
        # assume we find only one
        return self.root.find(xpath)