pgfplots "Soft clip" of "Fill between" not working with loglogaxis

Question

I am struggling with soft clipping a fill between when using a loglogaxis. The soft-clip domain seems to be completely off; i.e. setting soft clip={domain=1:1} yields the same result as no domain at all.

Yet a domain soft clip={domain=0:10000000000} results in a horizontal clip:

The pgfplots manual doesn't give an example for clipping on a loglogaxis, might it be it's simply not supported? If it is, can anyone point me on how to clip to soft clip={domain=3.7E4:5.5E5} ?

My MWE:

\documentclass[tikz]{standalone}

\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}

\begin{document}
    
    \begin{tikzpicture}
        \def\xmin{1E4}
        \def\xmax{1E7}
    
        \begin{loglogaxis}[
            xmin=\xmin,xmax=\xmax,
            ymin=1E-2,ymax=1000,
            xlabel={Re [-]},
            small,
            height=4cm,
            width=15cm,
            xtick={1E4,1E5,1E6,1E7},
            extra x ticks={3.7E4,5.5E5},
            extra x tick labels ={3.7E4,5.5E5},
            extra x tick style={
                tickwidth=\pgfkeysvalueof{/pgfplots/minor tick length},
                tick label style={yshift=-0.5mm}
            },
            ytick={1E-2,1E-1,1,10},
            yticklabels={,,1},
            extra y ticks={1E-2,1E-1},
            grid=major,
            domain=1E4:1E7,
            ]
            
            \def\D{1.4}     
            
            \def\yplus{30}
            \addplot[name path = C,thick,domain=1E4:1E7] {\yplus/((1/2*(2*log10(x)-0.65)^(-2.3)*(x/\D)^2)^(1/2)/1000)};
            
            \def\yplus{300}
            \addplot[name path = D,thick,domain=1E4:1E7] {\yplus/((1/2*(2*log10(x)-0.65)^(-2.3)*(x/\D)^2)^(1/2)/1000)};
                
            \addplot [gray!30] fill between[of=C and D, soft clip={domain=3.7E4:5.5E5}];
        
        \end{loglogaxis}
        
    \end{tikzpicture}%
    
\end{document}

Answer 1

You could use the following technique to clip it:

\documentclass[tikz]{standalone}

\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\pgfplotsset{compat=1.18}

\begin{document}
    
    \begin{tikzpicture}
        \def\xmin{1E4}
        \def\xmax{1E7}
    
        \begin{loglogaxis}[
            xmin=\xmin,xmax=\xmax,
            ymin=1E-2,ymax=1000,
            xlabel={Re [-]},
            small,
            height=4cm,
            width=15cm,
            xtick={1E4,1E5,1E6,1E7},
            extra x ticks={3.7E4,5.5E5},
            extra x tick labels ={3.7E4,5.5E5},
            extra x tick style={
                tickwidth=\pgfkeysvalueof{/pgfplots/minor tick length},
                tick label style={yshift=-0.5mm}
            },
            ytick={1E-2,1E-1,1,10},
            yticklabels={,,1},
            extra y ticks={1E-2,1E-1},
            grid=major,
            domain=1E4:1E7,
            ]
            
            \def\D{1.4}     
            
            \def\yplus{30}
            \addplot[name path = C,thick,domain=1E4:1E7] {\yplus/((1/2*(2*log10(x)-0.65)^(-2.3)*(x/\D)^2)^(1/2)/1000)};
            
            \def\yplus{300}
            \addplot[name path = D,thick,domain=1E4:1E7] {\yplus/((1/2*(2*log10(x)-0.65)^(-2.3)*(x/\D)^2)^(1/2)/1000)};
                
            \draw [
            help lines,
            name path=clippath]
                    (3.7E4,1E-2) rectangle (5.5E5,1E3);
                
            \addplot [gray!30] fill between[of=C and D,soft clip={clippath}];
        
        \end{loglogaxis}
        
    \end{tikzpicture}%
    
\end{document}