tendency to show an increase and then reach a plateau towards the end. The plateau occurs when the plants have grown beyond the area measured, which corresponds to the area of the plate. The plateau can be avoided by increasing the dimensions of the crop, but in our case that also caused an increase in the likelihood of erroneously measuring the neighboring plants. Training a mask R-CNN network to detect the boundary boxes of the individual plants could remove the plateau altogether ([@B15]), but would possibly still fail when the plants become so large that they overlap with their neighbours.

The loss of quantitative image data from 32 to 38 out of 1,800 plants was attributed to positioning of the cameras in relation to the plants. These errors canBanksy's No Ball Games mural removed from Tottenham wall Published duration 26 July 2013

image caption The artwork was removed on Thursday said a nearby office worker

A mural by street artist Banksy showing two children playing with a "no ball games" sign has been cut out of a wall in Tottenham, north London.

The graffiti, which appeared on the side of a shop at the junction of Tottenham High Road and Philip Lane in 2009, is to be sold for charity.

Janet Cooke, who works nearby, said an "iconic bit of Tottenham" had gone.

The firm managing the sale - the Sincura Group - said it had not been appreciated in situ.

'Beautiful piece'

Events company Sincura Group also put the Banksy mural Slave Labour up for auction in June.

image caption The brickwork with