# Symbol & text sizes

Label font sizes, typeface, colours etc. can be changed with the (Labels:**Data font**) button, and sizes of symbols increased or decreased from the default value of 100 by changing (Size: <ins>100</ins>), again in the Symbol area of the **Sample Labels & Symbols** tab – one of the most often used dialog boxes. Note that all such size parameters in PRIMER 7, whether for symbols or text (data labels, main or sub-titles, axes titles and scales etc.), are given relative to a default value (usually 100), rather than expressed in terms of a typeface point size, for example. This allows plots to be perfectly scaleable as their windows are resized or printed/saved, without the need for continual redefinition of sizes. 

In datasheet <ins>Exe nematode abundance</ins>, two of the environmental variables from <ins>Exe environmental</ins> have also been coded as binary factors: interstitial salinity (*Sal*) as Lo (<25%) or Hi (>71% of full seawater); and depth of the blackened anoxic layer (*H2S*) as Shall (<7.5cm) or Deep ($\ge$20cm) – look at these with **Edit>Factors**. As seen in Section [2](https://learninghub.primer-e.com/books/primer-v7-user-manual-tutorial/chapter/2-factors-and-indicators-identifying-sample-and-species-groups), there is often a choice of whether environmental variables associated with each assemblage sample are held as a separate data matrix, or as factors within the biological sheet. Here, it is useful to hold some of the data in both forms. With the dendrogram plot (<ins>Graph1</ins>) as the active window, take **Graph>Sample Labels & Symbols**> (Labels:✓Plot>✓By factor<ins>>H2S</ins>) & (Symbols:✓Plot>✓By factor> <ins>Sal</ins>).