Syntax for specifying pixel width for multiple columns in table

I have a basic table, but I need to specify the column widths in pixels.  5 Columns in total, different pixel values for each column.  

How do I write that specification:

[ColumnNumber] = 1 = 120

[ColumnNumber](1) = 120

I have tried a bunch of different ways.

Plus I need to specify 5 columns, so how do i join them together once I get 1 column right?

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