def d2scan(self, motor1, start1, finish1,
               motor2, start2, finish2, npts, dtime):
        self._checkmotors(motor1, motor2)
        current1 = self.motors[motor1].current()
        start1  += current1
        finish1 += current1

        current2 = self.motors[motor2].current()
        start2  += current2
        finish2 += current2

        self.a2scan(motor1, start1, finish1,
                    motor2, start2, finish2, npts, dtime)
d2scan: relative scan of 2 motors
dataset/ETHPy150Open xraypy/xraylarch/plugins/epics/spyk.py/Spyk.d2scan