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    "# Image masking\n",
    "\n",
    "There are several reasons a particular pixel in a specific image might not be\n",
    "useful:\n",
    "\n",
    "+ The pixel could be \"hot,\" meaning it isn't possible to remove the dark current\n",
    "from the pixel.\n",
    "+ The pixel could be bad in the sense that it does not respond to light the way\n",
    "the other pixels do.\n",
    "+ A cosmic ray can hit the pixel during the imaging.\n",
    "\n",
    "The following notebooks walk through identifying each of those types of bad\n",
    "pixels and how to create a mask for them."
   ]
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