(a) Directly from static pile load tests with efficient ξ1 and ξ2 for n pile load tests, given in Table A.9 of EN 1997-1 Annex A, (b) By calculation from profiles of ground test results or by calculation from ground parameters with effi-cient given in Table A.10 of EN 1997-1 Annex A, (c) Directly from dynamic pile load tests with effi-