I have the following table (minimised) in my document:
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\begin{table}[htbp]
\begin{tabular}{ccccc}
& Diamond size ($\mu$m) & Revolution speed (rpm) & Load (N) & Time (min)\tabularnewline
Grinding & 20 & 200 & 26 & 0.5\tabularnewline
\end{tabular}
\end{table}
It appears in the document as:
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Diamond size (µm) Revolution speed (rpm) Load (N) Time (min)
Grinding 20 200 26 0.5
How can I force a line break in each of the top cells such that the table appears as:
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Diamond size Revolution speed Load Time
(µm) (rpm) (N) (min)
Grinding 20 200 26 0.5