more figure changes

Author: kwinkunks

1712_FWI_forward_modeling/Figures/Figure1_composed.pdf

@@ -7671,7 +7671,7 @@
    "source": [
     "where the `grid` object provided by the `model` defines the size of the allocated memory region, `time_order` and `space_order` define the default discretization order of the derived derivative expressions.\n",
     "\n",
-    "We can now use this symbolic representation of our wavefield to generate simple discretized expressions for finite-difference derivative approximations using shorthand expressions, such as `u.dt` and `u.dt2` to denote $\\frac{\\partial u}{\\partial t}$ and $\\frac{\\partial^2 u}{\\partial t^2}$ respectively:"
+    "We can now use this symbolic representation of our wavefield to generate simple discretized expressions for finite-difference derivative approximations using shorthand expressions, such as `u.dt` and `u.dt2` to denote $\\frac{\\text{d} u}{\\text{d} t}$ and $\\frac{\\text{d}^2 u}{\\text{d} t^2}$ respectively:"
    ]
   },
   {