How do I assign a value in a macro from macro parameter in groff?

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I am trying to define macro .ML which will define record pO with the value from record hM which is defined through parameter 1.

This is what I tried:

.de ML
.nr hM \\$1
.nr pO \(hM
..
.ML 0.5
Introduction

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.bp
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And this is the error I get:

template.troff:5: warning: numeric expression expected (got a special character)

I suspect I am missing an important point on how records work in groff.

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