File Name : compressed figure s1.tif

Caption : supplement figure s1. distributions and spatial correlations of fe, p and s in single trichomes. light micrographs, false-color element (p, s, and fe) maps, one-dimensional line plots of fe, p, and s along the main axis of the trichome sections, and scatterplots of pixel-specific element concentrations [cps] of fe and s versus p extracted from the 1d line plots of trichodesmium trichomes collected during exponential growth (exp. i) are shown. for each trichome two sections were analyzed to illustrate the variance in the relationship between fe and p and s and p within a single trichome. the color scale for the element maps is shown, with warmer colors indicating higher element concentrations. black line: linear regression.