>>> retract = curve.data[1]
>>> retract.info['columns']
['z piezo (m)', 'deflection (m)', 'difference of retract deflection and approach deflection (m)']
->>> retract[:5,-1]
-Data([ -3.89891186e-09, -4.19359706e-09, -4.42027798e-09,
- -4.78296746e-09, -5.10032075e-09])
->>> retract[-5:,-1]
-Data([ 4.08025660e-10, 2.04012830e-10, 4.53361844e-10,
- 5.21366121e-10, 1.08806843e-09])
+>>> retract[:5,-1] # doctest: +ELLIPSIS
+Data([ -3.898...e-09, -4.193...e-09, -4.420...e-09,
+ -4.782...e-09, -5.100...e-09])
+>>> retract[-5:,-1] # doctest: +ELLIPSIS
+Data([ 4.080...e-10, 2.040...e-10, 4.533...e-10,
+ 5.213...e-10, 1.088...e-09])
Note the differences are not near zero because the z piezo position
runs in opposite directions for the two blocks.