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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: ax.text() box size determined incorrectly for *-subscript (cuts off text at bottom)","articleBody":"### Bug summary\n\nHello everyone,\n\nI have the case that I want to add some texual data to a plot. Therefore I need an subscript index for my math-symbol, which became *. It turned out that the text-box cuts off the bottom of the text when just givin * as subscript.\n\nI have created a sample code below which shows the following behaviour:\n\n\u003cimg width=\"636\" height=\"477\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/a4bee15f-64bd-4038-a473-d6d73194c05f\" /\u003e\n\nI tried to overcome that issue by adding a protected space (~) behind * `r\"$\\pm \\sigma_{*~}$\"` but the space is ignored with respect to the box-calculation.\n\nBest regards,\nDeph\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\n\nfontSize = 40\nfig, ax = plt.subplots(nrows=1, ncols=1)\nax.plot([0, 10],\n        [0, 10],\n        )\nax.text(0.175, 0.35, r\"$\\pm \\sigma_{e*}$\"                                           , transform=ax.transAxes, fontsize=fontSize, ha=\"left\" , va=\"top\")\nax.text(0.175, 0.19, r\"$\\pm \\sigma_{*}$\"                                           , transform=ax.transAxes, fontsize=fontSize, ha=\"left\" , va=\"top\")\n```\n\n### Actual outcome\n\nSee screenshot.\n\n### Expected outcome\n\nText gets not clipped off at bottom\n\n### Additional information\n\nUpgraded all packages before issue with `pip freeze | %{$_.split('==')[0]} | %{pip install --upgrade $_}`\nNote: I tested rcparam `useTeX=True` which worked. However, by that the font changed to the TeX-font. If I consider now using the `usetex` option means I have to re-finetune the optic a ton of plots.\n\nIDE: VS-Code 1.114.0 (system setup)\nVS-Code Plugins: Microsoft Python Plugins Version 2026.4.0\n\n### Operating system\n\nWindows 11\n\n### Matplotlib Version\n\n3.10.8\n\n### Matplotlib Backend\n\n3.10.8\n\n### Python version\n\n3.14.3\n\n### Jupyter version\n\nN/A\n\n### Installation\n\npip","author":{"url":"https://github.com/Dephrilibrium","@type":"Person","name":"Dephrilibrium"},"datePublished":"2026-04-09T14:49:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/31481/matplotlib/issues/31481"}