LaTeX how insert two pictures side by side?

% FIG4 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%% 
\ Figure the begin {} [hTBP]   % [hTBP] h is the mean floating 
    \ centering     % centered 
    
    \ subfloat [type the Lambda] % first sub FIG. 
    { 
        \ minipage the begin {} [T] { 0.5 \ textwidth} 
            \ centering           % subgraph centered 
            \ includegraphics [width = 0.5 \ textwidth]} {fig_Lambda.eps% to 0.5 times the size of the line width display 
        \ minipage} End { % 
    } % Note that this is not a carriage return empty row, or are arranged at the two graphs, rather than side by side 
    \ subfloat [the FWM type] % second sub FIG 
    { 
        \ minipage the begin {} [T] {0.5 \ textwidth} 
            \ centering       % subgraph centered 
            \ includegraphics [width = 0.5 \ textwidth]} {fig_FWM.eps% to 0.5 times the size of the line width display 
        \ minipage} End { 
    } % 
    
    \ {Caption Schematic Diagram of A Four -Level tripod-type atomic system driven by three coherent laser fields.}%% Larger name 
    \ label FIG1} {   % image reference mark 
\ end {figure}