A graphical user interface for display on a display screen of a user device is configured for display in a window occupying all or a portion of the display screen and has a first frame occupying a first frame region of the window. The first frame illustrates, adjacent to one another in a first dimension, graph visual elements each representing a respective graph data entry from a continuous subset among a sequence of graph data entries, each of the sequence having a defined placement and a quantitative value. The continuous subset is determined in response to selective zooming and/or scrolling of the first frame region by user interaction. The graph visual elements each have, in a second dimension, a linear extent or position determined according to the size of the first frame region in the second dimension, the quantitative value of the respective graph data entry, and dynamic scaling factor.