Aditya, This confuses me, I thought when using 3 columns I have to set n=3 otherwise I get errors about extra tab found etc. However doing as you suggested, seems to work. Then another question, the formula numbering is not aligned with the other formula's in my text like in the code below. How can I force the sub formula numbering to be right aligned ? Thanks Wim \def\ms{\,} \starttext \placeformula[calcb-chapter4-eqn2] \startformula f(x) = \sum_{n = - \infty}^{+\infty} c_{n} e^{\displaystyle i n \frac{\pi}{L} x} \quad \text{,} \quad c_{n} = \frac{1}{2L} \int\limits_{-L}^{L} f(x) \ms e^{- \displaystyle in\frac{\pi}{L} x } dx \stopformula Formula number is not right aligned with the previous formula \placesubformula \startformula \startalign[n=2,m=2,distance=2em] %\startalign[n=3] \NC f(x) \NC = \frac{1}{2\pi} \int\limits_{-\infty}^{+\infty} g(y) \ms e^{i y x} \ms dy \NC (x \in \reals) \NR[calcb-chapter4-eqn5:i][i] \NC g(y) \NC = \int\limits_{-\infty}^{+\infty} f(x) \ms e^{-i y x} d x \NC ( y \in \reals) \NR[calcb-chapter4-eqn5:ii][ii] \NC \int\limits_{-\infty}^{+\infty} |f(x)|^{2} dx \NC = \frac{1}{2\pi} \int\limits_{-\infty}^{+\infty} \Big| g(y) \Big|^{2} \ms d y \NC \quad \NR[calcb-chapter4-eqn5:iii][iii] \stopalign \stopformula \stoptext
How about
\startalign[n=2,m=2,distance=2em]
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