Fig. 3

Between-method distance repeatability in relation to distance mean length. Individual toad skulls were each measured twice with different methods: using a 3D digitizer (DIG); using CT scans at medium (MED) or high (HIGH) resolutions; CT scans at MED loaded in TINA-Landmark with distinct values of the compacting factors stride and down-sample (S2, S3, S2/D2 and S3/D2); and CT scans at MED with 0.5 mm aluminum filter (AL0.5) or 1.0 mm aluminum filter (AL1.0). Data from different methods were joined together and distance repeatabilities calculated, representing the reliability in placing landmarks with the different methods. The dashed lines indicate significant correlations between the variables. Numbers 1–24 correspond to the distances as described in Table 2. a) MED + HIGH; b) DIG + MED; c) DIG + HIGH; d) S2 + S3; e) S2 + S2/D2; f) S2 + S3/D2; g) S3 + S2/D2; h) S3 + S3/D2 and i) AL0.5 + AL1.0