This is a key word plot where the text is the file a1f in the British National Corpus (BNC), compared with the whole of the BNC.
|•||each key word (KW) (these obviously have to do with international relations)|
|•||a measure of its dispersion and its keyness|
|•||how many times each KW came in the text (hits).|
|•||a map showing where each word came.|
At the left the blue line represents the start of the text, at the right the blue line represents the end. Look at Britain, Germany, Italy and century -- these seem to come in bursts more or less three-quarters of the way through the text. China, Mao, Peking come together a bit later in the text.