measurement precision: readme update

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  - `px_basal_pronotum_width`: Euclidean distance between coordinate endpoints of the basal pronotal width (`coords_basal_pronotum_width`) expressed in pixels.
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  - `px_elytra_max_width`: Euclidean distance between coordinate endpoints of the maximum elytral width (`coords_elytra_max_width`) expressed in pixels.
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  - `cm_scalebar`: Calibrated length of the reference scalebar in centimeters. Constant value of 1.0 cm as this represents the standard reference scale used for all measurements.
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- - `cm_elytra_max_length`: Calibrated maximum elytral length in centimeters, calculated by converting pixel measurements using the scalebar calibration factor.
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- - `cm_basal_pronotum_width`: Calibrated basal pronotal width in centimeters at the elytro-pronotal suture, calculated by converting pixel measurements using the scalebar calibration factor.
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- - `cm_elytra_max_width`: Calibrated maximum elytral width in centimeters, representing the greatest transverse dimension across the fused elytra, calculated by converting pixel measurements using the scalebar calibration factor.
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  ## Dataset Creation
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  - `px_basal_pronotum_width`: Euclidean distance between coordinate endpoints of the basal pronotal width (`coords_basal_pronotum_width`) expressed in pixels.
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  - `px_elytra_max_width`: Euclidean distance between coordinate endpoints of the maximum elytral width (`coords_elytra_max_width`) expressed in pixels.
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  - `cm_scalebar`: Calibrated length of the reference scalebar in centimeters. Constant value of 1.0 cm as this represents the standard reference scale used for all measurements.
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+ - `cm_elytra_max_length`: Calibrated maximum elytral length in centimeters (up to 3 decimal places)<sup>[1](#footnote1)</sup>, calculated by converting pixel measurements using the scalebar calibration factor.
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+ - `cm_basal_pronotum_width`: Calibrated basal pronotal width in centimeters (up to 3 decimal places)<sup>[1](#footnote1)</sup> at the elytro-pronotal suture, calculated by converting pixel measurements using the scalebar calibration factor.
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+ - `cm_elytra_max_width`: Calibrated maximum elytral width in centimeters (up to 3 decimal places)<sup>[1](#footnote1)</sup>, representing the greatest transverse dimension across the fused elytra, calculated by converting pixel measurements using the scalebar calibration factor.
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+ <a name="footnote1">1</a>: The measurement is up to 3 decimal places. To obtain measurements with greater numerical precision (i.e. additional decimal places), use this equation: `cm_<measurement>` = `px_<measurement>`/`px_scalebar`.
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  ## Dataset Creation
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