The first is average kinetic energy per electron ( 𝒯 𝒫 ⁄ ), which has been investigated by Morgenstern et al. using another type of gradient bundle decomposition applicable to systems with linear symmetry (see chapter by Amanda Morgenstern). Unlike 𝒫 and 𝒯, that typically achieve maxima at bond paths, for bonds considered covalent the kinetic energy per electron typically has minimum CPs at bond paths. Note also that that the minimum basins of 𝒯 𝒫 ⁄ are nearly identical to the bonding regions defined by 𝒫, providing an alternative way to define the boundaries between bonding regions .