Comparison of the M81 flattened-structure parameters with M81 analogs from TNG50. On the x-axis, we plot the short over long axis ratio (b/a), and on the y-axis, we plot the number of corotating satellites. The green crosses show the parameters of the M81 analogs in simulations, and the pink star shows the parameter pair of the data. The top histogram shows the distribution of the axis ratios of the structures around simulated analogs, and the histogram on the right shows the corresponding number of kinematically correlated dwarfs. The pink shaded regions illustrate the analog systems that match or exceed the parameters found in the data. The inset texts indicate the corresponding frequencies of these systems in simulations. Left: Results for all simulated M81 analogs. Right: Results for the subsample of analogs that also feature an M82 analog.