PROCEDURE: slice2d PURPOSE: creates a 2-D slice of the 3-D distribution function CALLING SEQUENCE: slice2d, dat INPUTS: dat: standard 3d data structure KEYWORDS: all optional ROTATION: 'xy': the x axis is v_x and the y axis is v_y. (DEFAULT) 'xz': the x axis is v_x and the y axis is v_z. 'yz': the x axis is v_y and the y axis is v_z. rotations shown below require valid MAGF tag in the data structure 'BV': the x axis is v_para (to the magnetic field) and the bulk velocity is in the x-y plane. 'BE': the x axis is v_para (to the magnetic field) and the VxB direction is in the x-y plane. 'perp': the x-y plane is perpendicular to the B field, while the x axis is the velocity projection on the plane. 'perp_xy': the x-y plane is perpendicular to the B field, while the x axis is the x projection on the plane. 'perp_xz': the x-y plane is perpendicular to the B field, while the x axis is the x projection on the plane. 'perp_yz': the x-y plane is perpendicular to the B field, while the x axis is the y projection on the plane. ANGLE: the lower and upper angle limits of the slice selected to plot (DEFAULT [-20,20]). THIRDDIRLIM: the limits of the velocity component perpendicular to the slice plane (Def: inactivated) Once activated, the ANGLE keyword would be invalid. XRANGE: vector specifying the xrange (Def: adjusted to energy range) RANGE: vector specifying the color range (Def: from min to max of the unsmoothed, uninterpolated data) ERANGE: specifies the energy range to be used (Def: all energy) UNITS: specifies the units ('eflux', 'df', etc.) (Def. is 'df') NOZLOG: specifies a linear Z axis POSITION: positions the plot using a 4-vector NOFILL: doesn't fill the contour plot with colors NLINES: says how many lines to use if using NOFILL (DEFAULT 60, MAX 60) NOOLINES: suppresses the black contour lines NUMOLINES: how many black contour lines (DEFAULT 20, MAX 60) REMOVEZERO: removes the data with zero counts for plotting SHOWDATA: plots all the data points over the contour VEL: specifies the bulk velocity in the instrument coordinates used for subtraction & rotation (default is calculated with v_3d) NOGRID: forces no triangulation (no interpolation) NOSMOOTH: suppresses smoothing IF NOT SET, DEFAULT IS SMOOTH (boxcar smoothing w/ width=3) SUNDIR: specifies the sun direction in the instrument coordinates if set, sun direction line is plotted NOVELLINE: suppresses the velocity line SUBTRACT: subtracts the bulk velocity before plot if there are few data points around (0,0), use ThirdDirLim keyword to select data points RESOLUTION: resolution of the mesh (DEFAULT 51) ISOTROPIC: forces the scaling of the X and Y axes to be equal CREATED BY: Yuki Harada on 2014-05-26 Modified from 'thm_esa_slice2d' $LastChangedBy: haraday $ $LastChangedDate: 2014-10-10 08:17:06 -0700 (Fri, 10 Oct 2014) $ $LastChangedRevision: 15972 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/science/slice2d.pro $