Quoting Stepan Roucka <[EMAIL PROTECTED]>:

> Thanks,
> with \startalign[n=1] the formulas don't overlap anymore, but they 
> are still too
> close. Here is test example:
>
> \setupoutput[pdftex]
> \enableregime[utf]
> \setupindenting[yes,medium]
>
> \starttext
>
> \startformula\startalign[n=1]
> 2I_{\rm d} = I_{\rm e}^0
>  \left[\exp\left({-qU\over k_{\rm B}T_{\rm
> e}}\right)-1\right]+I_{\rm i1}-I_{\rm i2}
> \stopalign\stopformula
>
> \placeformula[eq:debye]
> \startformula\startalign[n=1]
> \lambda_{\rm D} = \sqrt{\epsilon_0 k_{\rm B}T_{\rm
> e}\over nq_{\rm e}^2}
> \stopalign\stopformula
> \stoptext

What I meant was


\setupoutput[pdftex]
\enableregime[utf]
\setupindenting[yes,medium]

\starttext

\placeformula \startformula\startalign[n=1]
  \NC 2I_{\rm d} = I_{\rm e}^0
      \left[
        \exp\left({-qU\over k_{\rm B} T_{\rm e}}\right)
        -1 \right]
     + I_{\rm i1}-I_{\rm i2} \NR
  \NC \lambda_{\rm D} =      \sqrt{\epsilon_0 k_{\rm B}T_{\rm e} \over 
nq_{\rm e}^2}
  \NR[eq:debye]
\stopalign\stopformula

or better

\placeformula \startformula\startalign[n=2]
  \NC 2I_{\rm d} \EQ I_{\rm e}^0
      \left[
        \exp\left({-qU\over k_{\rm B} T_{\rm e}}\right)
        -1 \right]
     + I_{\rm i1}-I_{\rm i2} \NR
  \NC \lambda_{\rm D} \EQ
      \sqrt{\epsilon_0 k_{\rm B}T_{\rm e} \over nq_{\rm e}^2}
  \NR[eq:debye]
\stopalign\stopformula

\stoptext

If you feel that some formulas are too close, you can add 
\noalign{\vskip 1ex} between lines. Otherwise, if you want all 
multi-line formulas to be more spread out, change

\def\displayopenupvalue{0.25\bodyfontsize}

to something other than .25. \displayopenup value is equivalent to \jot 
in plain tex.

Aditya


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