The term angle of extinction is identified in base64 scheme by the sequence YW5nbGUgb2YgZXh0aW5jdGlvbg==, while the MD5 signature is equal to 7ab1d490f73ae440407314972869184a. The ASCII encoding of angle of extinction in hexadecimal notation is 616e676c65206f6620657874696e6374696f6e.