Fig. 1.
From: Ion distributions in the vicinity of Mars: Signatures of heating and acceleration processes
Statistical distribution of O+ from the sample region 6 as shown in Fig. 2. The upper panel shows the logarithm of the average distribution function (m−6 s3) as a colour scale, with a fitted two-dimensional Maxwellian shown as black contour lines. Straight vertical and horizontal black lines indicate the centre of the fitted distribution. Slices of the distribution function along the vertical and horizontal lines are shown in the lower panel, with black for the vertical line (V x = Vdriftx) and red for the horizontal line (V r = Vdriftr). Solid lines show the fitted function, while circles connected with a solid line show measured data.