Suppress ROWS Axis header output in MDX

I have a Reporting Services report with an MDX query that returns ~150k rows.  The ROWS axis is a cross join of a few dimensions, some of which have long text fields that results in a data payload of over 20 MB.  If I could restrict the query to only return the COLUMNS axis and not of the the ROWS axis, it would greatly reduce the size of the payload.

Currently, the output looks like this:

Dim1   Dim2   Dim3   Measure1     Measure2 Measure3
(Text) (Text) (Text) DesciptionA  0.75     100
(Text) (Text) (Text) DesciptionB  1.25     200

I would like it to look like this:

Measure1     Measure2 Measure3
DesciptionA  0.75     100
DesciptionB  1.25     200

Is this an option suppress row headers or use a subselect to achieve this?

Thanks,

Mitch