[<Peak flat filter peak 0 of surface deflection 610 [ -1.156...e-09 -8.840...e-10 -3.173...e-10 -7.480...e-10]>]
>>> retract.info['columns']
['z piezo (m)', 'deflection (m)', 'surface distance (m)', 'surface deflection (m)', 'flat filter peaks (m)']
[<Peak flat filter peak 0 of surface deflection 610 [ -1.156...e-09 -8.840...e-10 -3.173...e-10 -7.480...e-10]>]
>>> retract.info['columns']
['z piezo (m)', 'deflection (m)', 'surface distance (m)', 'surface deflection (m)', 'flat filter peaks (m)']