FIGURE 41 in A morphometric diagnosis using continuous characters of Pinnunavis edkuensis, sp. nov. (Bacillariophyta: Bacillariophyceae), a brackish-marine species from Egypt

FIGURE 41. Comparison of the gap size in the continuous character inter-raphe distance and the t-values from paired t-tests on random samples (n = 20) of inter-raphe distance from two hypothetical groups. Four sets of 1000-replicate simulations show the effects of varying the distance between the parametric means of Group A (µA = 1.5, fixed) and Group B (variable, values shown on the chart). In all simulation sA = sB = 0.29. The dashed red line indicates the critical t-value (one-tailed) for all comparisons except µB = 1.5, for which the dashed blue line indicates the two-tailed critical t-value. Positive gap distances (shaded light blue) between paired samples indicate no range overlap, i.e. a gap, while negative inter-raphe distances indicate range overlap, i.e. no gap.