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(nasm.info)Section 6.1.2

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6.1.2. `bin' Extensions to the `SECTION' Directive
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   The `bin' output format extends the `SECTION' (or `SEGMENT')
directive to allow you to specify the alignment requirements of
segments.  This is done by appending the `ALIGN' qualifier to the end
of the section-definition line. For example,

     section .data   align=16

   switches to the section `.data' and also specifies that it must be
aligned on a 16-byte boundary.

   The parameter to `ALIGN' specifies how many low bits of the section
start address must be forced to zero. The alignment value given may be
any power of two.