"marked in gray" is a correct and usable phrase in written English.
"Marked in gray" can be used to refer to something that has been highlighted in gray. For example, "I circled the correct answer on the worksheet and marked it in gray."
Terminal leaves of the topic model are marked in gray.
Items marked in gray served as the respective reference categories.
Of these, the vast majority were expressed in Sf9 cells and GPCRs expressed in other kinds of cell lines are marked in gray.
Figure 9 shows the radiation pattern of the studied antenna, with the elevation range (between 11.7° and 39.7° as calculated according to the longitude range) marked in gray.
Next, part 2 marked in gray is an inception module which contains one max pooling layer and four convolutional layers with different kernel sizes.
In Fig. 4 the de-bonded areas are marked in gray on the plate surface, showing their relationship to the bonded areas along the length of the test plate.
Here's an early one I marked: "In dim gray light and fleeting rays of sun, the toiling seas turn molten, and still the great birds glide through the endless twilight, carving the cold air on rigid wings.
Most of the infiltrating cells were granulocytes (Fig. 7b), and the density of the infiltrated cells was more marked in the gray matter than in the white matter, as previously mentioned.
Subspace clusters, which are not in the filter, can be marked in very light gray or could also be removed entirely from the visualization.
The top of each figure contains the ERD time course at channel Cz, while the scalp maps corresponding to the intervals marked in light and dark gray are depicted for some of the best performing methods in the bottom part.
These bands, with bandwidth of W1 = W2 = 10 MHz, are marked in Figures 8 and 9 with vertical gray lines.
