I tried to write METrate (where rate denotes the subscript) as $MET_rate$. But only r appears as subscript.When I tried writing it as $MET_r_a_t_e$ I get it in the correct format during compilation as expected but it throws an error "Double subscript".

  • Using braces {…} to get all the expression as a subscript probably answer your question. But writing this expression in math mode (i.e., surrounded by $) is probably wrong. You should have a look at this answer on \textsubscript and consider using mathrm or operatorname. – Clément Dec 1 '15 at 5:23

Just put the subscript within curly braces. Replace $MET_rate$ by $MET_{rate}$.

  • 1
    Better still, write either $\mathrm{MET}_{\mathrm{rate}}$ or $\mathit{MET}_{\mathit{rate}}$, depending on whether the variable names "MET" and "rate" should be rendered in upright or italic form. – Mico Dec 1 '15 at 6:48

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