why readtable create field “D” in the struct “D1”?

function D1=TEST()

D=readtable('test.txt','delimiter',',');
save canc.tset D
D1=load('canc.tset',"-mat")
end

i access it using
D1.D...
it's possibile to avoid "D" field?

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If there is only one variable in the MAT file (regardless of its extension) and you do not know/care what its name is:

C = struct2cell(load(..));
assert(isscalar(C),'Only one array can be LOADed')
T = C{1}

If the variable name is known in advance, e.g. “D”

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why readtable create field "D" in the struct "D1"?

why readtable create field "D" in the struct "D1"?