With most fonts, when the size is less than 11, tildes (ã ẽ ĩ õ ũ ñ) are shown as a dash. Consequently, I cannot distinguish tilde (ã) from macron (ā).
This problem occurs on Firefox (tildes are dashes on Gmail), but it does not occur on Libre Office using the same fonts and the same size. Furthermore, this problem does not occur on Firefox on another distro.
I am using Lubuntu 14.04.
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