You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wingCreateExternal.m
    path of file: ./repos/LADAC/aerodynamics/vlm_wing/external
    
    the code of the file until where you have to start completion: function external = wingCreateExternal( n_panel, n_panel_x )

% Disclamer:
%   SPDX-License-Identifier: GPL-3.0-only
% 
%   Copyright (C) 2020-2022 Yannic Beyer
%   Copyright (C) 2022 TU Braunschweig, Institute of Flight Guidance
% *************************************************************************

% external additional wind concentrated vectors in body frame, m/s
external.V_Wb = zeros( 3, n_panel, n_panel_x );
% external additional time-derivative of wind in body frame, m/s
external.V_Wb_dt = zeros( 3, n_panel, n_panel_x );

    
function external = wingCreateExternal( n_panel, n_panel_x )

% Disclamer:
%   SPDX-License-Identifier: GPL-3.0-only
% 
%   Copyright (C) 2020-2022 Yannic Beyer
%   Copyright (C) 2022 TU Braunschweig, Institute of Flight Guidance
% *************************************************************************

% external additional wind concentrated vectors in body frame, m/s
external.V_Wb = zeros( 3, n_panel, n_panel_x );
% external additional time-derivative of wind in body frame, m/s
external.V_Wb_dt = zeros( 3, n_panel, n_panel_x );
% atmosphere struct
external.atmosphere = isAtmosphere(0);

end