Exact(3)
In the illuminated arena, the distance traveled by spiny mice was significantly affected by the density of stones.
While it was the density of stones rather than their number that accounted for the increased activity in the illuminated arena, introducing stones into a dark arena did not affect the level of activity, and the distance traveled was high regardless of number of stones or their density.
Another traditional way to judge the density of stones without measuring is to observe the sound of plastic beads gently tapping each other.
Similar(5)
Important controls on the density of stone walls include surficial materials (e.g., ∼4.0 km/km2 on glacial till compared to 1.5 km/km2 on floodplain alluvium), and whether land had been "improved" for agriculture (∼5.2 km/km2).
You are living by the sea – mostly off the sea – with your back to the Highlands, surrounded by an intense folk culture of myth, song and superstition and the highest density of standing stones in Britain.
A whole world seems to be here, caught between the density of the stone and the weightlessness of the bag.
However, stone density of four/m2 significantely increased activity, as shown for small arena with four stones or large arena with 16 stones (Fig 1).
Thus, activity of spiny mice in a dark arena was steady and high, regardless of the number of stones or their density (Table 2).
Related(1)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com