Comments on: “The Harp Time Projection Chamber: Characteristics and physics performance” by V. Ammosov et al.

Serious doubts about the correctness of the method of distortion corrections of the HARP TPC described in the paper of Ammosov et al. are expressed. An ill-defined iteration procedure is applied that can hardly lead to correct results. Several corrections are introduced “by hand” with the clear aim to shift the respective distributions to the “right places”. The claimed momentum resolution and the absence of a bias in the momentum scale at the level of 2% are not confirmed by physical benchmarks and remain unjustified.