An example is:
# m=3 put[+2cmU](0.5,0.5) Center
the text Center will be written in the middle of the graph (the coordinates are written within parentheses); the font size, the text orientation and justification are given within brackets, and here the font is magnified 2 times (+2), the text is oriented to the top (U), centered horizontally (c) and vertically (m).
Note that a mode (3 in the example) may be given to choose the line mode; it is esentially used to chose the color, 3 corresponding to blue (unless modified by the –pen-colors option).
The meanings of the various parameters within the square brackets are:
The font used and default size are those of the title (label), i.e. specified in the program graph with the arguments –title-font-name and –title-font-size.
The various texts (captions along the axes, label of the plot) may be specified using the TEX conventions, which are especially simpler to express exponents and indices. Another convention, the soft-TEX is also usable.
The convention is that, when the text to write on the plot starts by the sequence
The main difference is in the way of specifying indices and exponents: e5+α would be written e^{5+\alpha} in the TeX-way, but e^5+{alpha}^ in the soft-TEX way, which uses the carret at both beginning/end of the exponent. For indices, the undercore (_) is used in place of the carret (^).