Brother TD-4100N - Manual (Page 63)

. One dot of the image data is enlarged as follows according to the value of m.
・ As a result, the image is sized depending on the value of m as follows:
m = 32 48 dots vertically x (n1 + n2 *256) * 6 dots horizontally
m = 33 48 dots vertically x (n1 + n2 *256) * 3 dots horizontally
m = 38 48 dots vertically x (n1 + n2 *256) * 4 dots horizontally
m = 39 48 dots vertically x (n1 + n2 *256) * 2 dots horizontally
m = 40 48 dots vertically x (n1 + n2 *256) * 1 dots horizontally
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m = 32 m = 33 m = 38 m = 39 m = 40