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: T_entry.m
    path of file: ./repos/celes/src/scattering
    
    the code of the file until where you have to start completion: %  Copyright (c) 2017, Amos Egel (KIT), Lorenzo Pattelli (LENS)
%                      Giacomo Mazzamuto (LENS)
%  All rights reserved.
%
%  Redistribution and use in source and binary 
    
function Q = T_entry(tau,l,kM,kS,R,varargin)

% The conventions are according to Bohren and Huffman's textbook.
% There is a twist: for tau=1 we have Q=-b and for tau=2 we have Q=-a in
% the case of scattered field Mie coefficients.
% This has to do with the definition of a and b in BH, see also
% Mishchenko: "Scattering, Absorption and Emission of Light by Small
% Paritcles", equations (5.42) and (5.43).

m = kS/kM;
x = kM*R;
mx = kS*R;

jx = sph_bessel(1,l,x);
jmx = sph_bessel(1,l,mx);
hx = sph_bessel(3,l,x);
djx = dx_xz(1,l,x);
djmx = dx_xz(1,l,mx);
dhx = dx_xz(3,l,x);

if(isempty(varargin))
    varargin={'scattered'};
end