Is there a way to adjoin grids in DX without interpolation?

I have rectangular sections of a very large gridded dataset (regular
positions/connections) stored on disk.  Same deltas, but each has its own
origin.

I want to load 2 different adjacent sections and combine them into one
regular grid:


        0 -----> (m-1)       m -----> (2m-1)      0 ---------------> (2m-1)
                                                 
         ----------           ----------           -------------------- 
        |          |         |          |         |                    |
        |          |    +    |          |    =    |                    |   
        |          |         |          |         |                    |
        |          |         |          |         |                    |
         ----------           ----------           -------------------- 

Essentially, just re-interleave the data arrays.

How?  (I feel like I must be missing something obvious.)

Thanks,

Randall

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