Fig. 4

Electrical impedance tomography (EIT) images of stems of three floribunda rose varieties after a controlled freezing test on 22 February. The colour bars on the right side of each image represent the reconstructed values (relative values with a range between 0 and 0.1). The red color numbers under each image represent the largest value of the reconstructed value on each freezing temperature. They are not in the original images and are inserted numbers.