Weird vertical gaps in table

[alpine mortar]

I have a table with weird vertical gaps in some sections. Any idea of how to fix?

Table code: \begin{tabular}{lr|rrr|rrr|} \cline{3-8} & \multicolumn{1}{l|}{} & \multicolumn{3}{c|}{Deep non-polar ocean} & \multicolumn{3}{c|}{Global ocean} \\ \cline{2-8} \multicolumn{1}{l|}{} & \multicolumn{1}{l|}{Wave drag $\chi$} & \multicolumn{1}{l|}{Total RMSE} & \multicolumn{1}{l|}{Amplitude error} & \multicolumn{1}{l|}{Phase error} & \multicolumn{1}{l|}{Total RMSE} & \multicolumn{1}{l|}{Amplitude error} & \multicolumn{1}{l|}{Phase error} \\ \hline \multicolumn{1}{|r|}{Spherical harmonic SAL, $n=40$} & 0.8 & \multicolumn{1}{r|}{5.66} & \multicolumn{1}{r|}{2.85} & 4.89 & \multicolumn{1}{r|}{7.92} & \multicolumn{1}{r|}{4.81} & 6.30 \\ \hline \multicolumn{1}{|l|}{Spherical harmonic SAL, $n=200$} & 0.8 & \multicolumn{1}{r|}{5.62} & \multicolumn{1}{r|}{2.83} & 4.85 & \multicolumn{1}{r|}{7.83} & \multicolumn{1}{r|}{4.80} & 6.19 \\ \hline \multicolumn{1}{|r|}{Convolution SAL} & 0.4 & \multicolumn{1}{r|}{4.14} & \multicolumn{1}{r|}{2.71} & 3.13 & \multicolumn{1}{r|}{6.93} & \multicolumn{1}{r|}{4.69} & 5.10 \\ \hline \multicolumn{1}{|r|}{Mixed SAL} & 0.6 & \multicolumn{1}{r|}{3.69} & \multicolumn{1}{r|}{2.39} & 2.81 & \multicolumn{1}{r|}{6.36} & \multicolumn{1}{r|}{4.51} & 4.49 \\ \hline \end{tabular}

(from the online latex table maker)

[plain lance]

Hmm I can't replicate this, is there more to the preamble?

[alpine mortar]

Sobbing

Uh this is a journal template

[plain lance]

bruh

[plain lance]

is the template available on overlefa

ok ta

ok so far i've found out it's their loading of array and something else

this is what I comment out \RequirePackage{array} which is an improvement

[alpine mortar]

woe

[plain lance]

I think the only hack right now (since we can't touch the tempalte) is to use \noalign{\vskip-<some value>}

after cline and \\

\begin{tabular}{lr|rrr|rrr|}
    \cline{3-8}\noalign{\vskip-.4em}
    &
    \multicolumn{1}{l|}{} &
    \multicolumn{3}{c|}{Deep non-polar ocean} &
    \multicolumn{3}{c|}{Global ocean} \\\noalign{\vskip-.2em}
    \cline{2-8}\noalign{\vskip-.4em}
    \multicolumn{1}{l|}{} &
    \multicolumn{1}{l|}{Wave drag $\chi$} &
    \multicolumn{1}{l|}{Total RMSE} &
    \multicolumn{1}{l|}{Amplitude error} &
    \multicolumn{1}{l|}{Phase error} &
    \multicolumn{1}{l|}{Total RMSE} &
    \multicolumn{1}{l|}{Amplitude error} &
    \multicolumn{1}{l|}{Phase error} \\ \hline
    \multicolumn{1}{|r|}{Spherical harmonic SAL, $n=40$} &
    0.8 &
    \multicolumn{1}{r|}{5.66} &
    \multicolumn{1}{r|}{2.85} &
    4.89 &
    \multicolumn{1}{r|}{7.92} &
    \multicolumn{1}{r|}{4.81} &
    6.30 \\ \hline
    \multicolumn{1}{|l|}{Spherical harmonic SAL, $n=200$} &
    0.8 &
    \multicolumn{1}{r|}{5.62} &
    \multicolumn{1}{r|}{2.83} &
    4.85 &
    \multicolumn{1}{r|}{7.83} &
    \multicolumn{1}{r|}{4.80} &
    6.19 \\ \hline
    \multicolumn{1}{|r|}{Convolution SAL} &
    0.4 &
    \multicolumn{1}{r|}{4.14} &
    \multicolumn{1}{r|}{2.71} &
    3.13 &
    \multicolumn{1}{r|}{6.93} &
    \multicolumn{1}{r|}{4.69} &
    5.10 \\ \hline
    \multicolumn{1}{|r|}{Mixed SAL} &
    0.6 &
    \multicolumn{1}{r|}{3.69} &
    \multicolumn{1}{r|}{2.39} &
    2.81 &
    \multicolumn{1}{r|}{6.36} &
    \multicolumn{1}{r|}{4.51} &
    4.49 \\ \hline
\end{tabular}

Like this

yields this

[alpine mortar]

Thanks