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+### Summary
+
+The following data set contains the raw MRI (T1-weighted) and DTI scans of the dominant lower leg
+of 32 adults (males, females, young adults, older adults). These data were used to analyse the
+regional variation in muscle fibre lengths in the medial and lateral gastrocnemius muscles. The T1-
+weighted scans were used to segment the muscles and the DTI scans were used to reconstruct the
+muscle fibre architecture. For the latter, a previously published pipeline was implemented (Bolsterlee
+et al., 20191). The Matlab scripts that were then used to further process and assign the reconstructed
+muscle fibres to specific muscle regions are also available with the data set. Below is additional
+information that can be used complementary to the information provided in the manuscript. The first
+section describes the implementation of the previously published pipeline for fibre tracking 1. While
+this may provide some additional information to help describe the structure of the current data set,
+we recommend the documentation originally published for this pipeline1. The second section
+provides additional information to the reasoning and implementation of further analyses to assess
+the regional muscle fibre lengths from the data. Please cite the appropriate sources when using any
+of these analysis scripts or data.
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