 Hi, everyone. My name is Christine Chai and I work at Microsoft. Today, I'm going to talk about improving accessibility in data visualizations created by Ggplot2. Accessibility is the practice of ensuring everyone can access our content, including people with disabilities. Making data visualizations accessible allows us to increase the size of the audience pool, resulting in a larger potential impact. We will demonstrate how to improve accessibility in the graphs created by the R package Ggplot2. Let's see an example of how to customize the trends. We start with a graph of product annual sales with two items, Alpha and Beta. Alpha is the red trend and Beta is the green trend. However, this graph is not accessible because the two trends can be distinguished by only color, so people who cannot see color will have a hard time understanding this graph. To make it accessible, one way is to change the line types. We use Ggplot2's function geompath, line type equals product to change the line types by trend. We also use scale line type manual, dashed and solid to include the line types in the legend. The graph becomes accessible because Alpha is dashed and Beta is solid, and the two trends can be distinguished without color. On the other hand, we can also change the point shapes to make the graph become accessible. The geopoint shape equals product changes the point shapes by trend, and the scale shape manual, circle and triangle includes the point shapes in the legend. In this way, this is another accessible graph, and the Alpha is the circle points, Beta is the triangle points, so people can distinguish this graph with the point shape when even without colors. In conclusion, we can use color but we should not solely rely on color. Each trend needs to be distinguishable in the absence of color. Otherwise, people with color blindness won't be able to read the graph. This is about 300 million people or 4.5 percent of the global population. The final message is, data visualizations should be accessible. If not, we are not doing this right. Thank you.