In the CGDE region III, the current density is almost constant, and the vapor layer does not change significantly compared to regions I and II, allowing for a more quantitative evaluation of the processes. We determined the average size of the vapor layer from the high-speed camera images recorded in this region III. A dataset of 740 images, recorded with a frame rate of 1000 fps and starting at 460 ms after the ignition, was used for the analysis. In each image 600 rows of pixels were evaluated, which includes almost the entire wire (excluding the tip of the wire and the region close to the electrolyte surface). The documentation on the underlying Python-based custom tools can be found in the Data Availability Section. The evaluation of each frame is illustrated for a representative image depicted in Fig. . The outline of the electrode, determined from an image before the electrolysis, is indicated by dotted white lines and the center of the wire by a solid gray line. The border between the vapor layer and the electrolyte was determined for each line in the image on each electrode side by detecting steps in the pixel brightness and is indicated by the solid white line in Fig. . In some regions of the images, artifacts are observed (marked by a yellow circle), which are primarily caused by changes in the refractive index in the proximity of the vapor layer. This phenomenon is also known as schlieren. The frequency of these artifacts is, however, low and is not significant for the following statistical evaluation. The region around the electrode tip was not considered in the analysis due to the more complex convex shape of the vapor layer there.