While I cannot see the chart you're referring to, I can provide some general information on ethnic diversity for the countries you mentioned.
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Indonesia - Indonesia is known for its significant ethnic diversity, with over 300 ethnic groups, the largest being the Javanese. Each group has its own language and culture.
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Malaysia - Malaysia also has a diverse ethnic composition, primarily consisting of Malays, Chinese, and Indians, alongside various indigenous groups.
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Myanmar - Myanmar is home to many ethnic groups, including the Burman, Shan, Karen, and many others, leading to considerable ethnic diversity.
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Philippines - The Philippines has over 175 different ethnolinguistic groups, making it quite diverse as well, with major groups including Tagalog, Cebuano, and Ilocano.
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Thailand - Thailand is primarily dominated by the Thai ethnic group, but there are also several minority groups including the Karen, Lao, and various hill tribes.
Based on general knowledge, Indonesia is often considered the most ethnically diverse among these nations due to its vast number of distinct ethnic groups spread across its many islands. However, the interpretation of "greatest ethnic diversity" can vary based on the specific criteria used (such as linguistic diversity, cultural practices, etc.).