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![lecture notes on galaxy clusters [1/x]](https://64.media.tumblr.com/1bf765d59444a95063bcbfec15abde2d/9adf47eb6682bc52-ba/s640x960/c0e551ea9ad71a34b38117b50f89aeb3144f6ebb.png "lecture notes on galaxy clusters [1/x]")
![lecture notes on galaxy clusters [1/x]](https://64.media.tumblr.com/c659eb46827bb5eca14c7a162e21e050/9adf47eb6682bc52-8d/s640x960/e635668445362db158890ed058fa4e6c8552a7eb.png "lecture notes on galaxy clusters [1/x]")
![lecture notes on galaxy clusters [1/x]](https://64.media.tumblr.com/60b3c6f571d0df36db3b0a28b21522f8/9adf47eb6682bc52-7b/s640x960/5d4f8659358030732ab273d387d13d2bbc8f4881.png "lecture notes on galaxy clusters [1/x]")
![lecture notes on galaxy clusters [1/x]](https://64.media.tumblr.com/dd733463ca621a9fb828723bcf4e58ff/9adf47eb6682bc52-67/s640x960/e0479143b6699e02ded5d762143c159d6f0a4d10.png "lecture notes on galaxy clusters [1/x]")
![lecture notes on galaxy clusters [1/x]](https://64.media.tumblr.com/0b1d8fbe9ac37cb7ae3d521d87d4606c/9adf47eb6682bc52-30/s640x960/5884d67a4c8f3e1a9c5c63c06daed174ec3c5ba4.png "lecture notes on galaxy clusters [1/x]")