Colorfill plot gives large gap for MARI when converted to DeltaE

[martyngigg]

The script below converts a MARI file to SpectrumNo/DeltaE and plots a 2D plot.

There is a large white gap at the bottom that should not be there.

from DirectEnergyConversion import setup_reducer

reducer = setup_reducer('MARI')
ei = 11
reducer.energy_bins = [-11,0.05,11]
# Disable auto save
reducer.save_formats = []
reducer.map_file = 'mari_res.map'

mono_run = 11015
white = 11060
# Diagnostics
reducer.diagnose(white, sample=mono_run)
delta_e = reducer.convert_to_energy(mono_run=mono_run, ei=ei, white_run=white)
m = importMatrixWorkspace(delta_e.getName())
m.plotGraph2D()

[martyngigg]

This issue was originally trac ticket 4586