iroute - equals 1 to plot to the screen, 2 to create a postscript file, 3 to create a plot file for the VERSATEC plotter, or 4 to create a colour postscript file; if iroute does not equal 1 there is no plotting to the screen (default: 1) iseg - create a Uniras segment(s) (default: 0) iplot - generate the plot during the run (1), or write all plot commands to the file p.out (0), or do both (2) (default: 1) imod - plot model boundaries (default: 1) ibnd - plot vertical model boundaries (default: 1) idash - plot model boundaries as dashed lines (default: 1) ivel - plot the P-wave (1) or S-wave (-1) velocity values (km/s) within each trapezoid of the model (default: 0) iray - plot all rays traced (1) or only those which reach the surface (or reflect off the floating reflector for ray groups for which frbnd>0) (2); rays traced in the search mode are not plotted unless irays=1 (see below) (default: 1) irays - plot the rays traced in the search mode (default: 0) irayps - plot the P-wave segments of ray paths as solid lines and the S-wave segments as dashed lines (default: 0) idot - plot a symbol at each point (step length) defining each ray path (default: 0) itx - plot the calculated travel time-distance values as lines (1), symbols of height symht (2), symbols of height symht interpolated at the observed receiver locations contained in the file tx.in (invr=1 must be used, if not, itx=2 is used) (3); or as residuals measured from the oberved data in tx.in (invr=1 must be used) (4); no calculated travel times are plotted if itx=0 (default: 1) itxbox - plot only those calculated and observed travel times that have distances between xmint and xmaxt and times between tmin and tmax (default: 0) idata - plot the observed travel time picks from the file tx.in (1 or -1), or plot only those picks used in the inversion if invr=1 (2 or -2); the observed data are represented by vertical bars with a height of twice the corresponding uncertainty specified in the file tx.in if idata>0, or by symbols of height symht if idata<0 (default: 0) isep - plot the model and rays and travel times in the same plot frame (0), separate plot frames (1), plot the model and rays and travel times in a separate plot frame for each shot (2), or plot the model and rays in separate plot frames for each shot followed by the travel times in separate plot frames for each shot (3) (default: 0) Note: the value of isep may be changed during a program run with entry from the keyboard of the values 0, 1, 2 or 3 between plot frames when a <CR> is needed to continue; entering "s" will terminate the program run ibreak - an array corresponding to the ray groups listed in the array ray to split travel time-distance curves into prograde and retrograde segments when plotting with itx=1, and to increment the integer code by one in the file tx.out when changing from a prograde to retrograde segment or vice versa if itxout=1 (default: 1) iszero - plot the calculated and observed travel times as if all shot points were at 0 km and the rays travelled left to right (default: 0) itxout - write the calculated travel time-distance pairs to the file tx.out; the integer code identifying each pick is determined by the array ibreak if itxout=1 or the array ivray if itxout=2 or 3; if itxout=3, the calculated travel times are interpolated to the observed receiver locations (invr=1 must be used if itxout=3, if not, itxout=2 is used) (default: 0) Note: there appears to be a bug with itxout, itx=itxout may be necessary for correct results idump - write detailed velocity model and ray tracing information to the file r2.out and the namelist parameter values to the file n.out; mainly for debugging (default: 0) Note: using idump=1 will greatly slow down the run time isum - write a short summary about the rays traced and the velocity model to the screen (1), also write the travel time residuals and chi-squared values for each phase and shot to the file r1.out (2), and to the screen (3) (must use invr=1 for isum>1) (default: 1) istep - pause after each ray is plotted writing its take-off angle to the screen and waiting until a <CR> is entered before plotting the next ray; this is mainly intended to be used in conjunction with irays=1 to determine the cause of the failure of the search mode for a particular ray group; entering "s" after any ray will terminate the program run (default: 0)

symht - height of symbols (mm) used when plotting each point defining a ray path, single point travel time curves (if symht=0, single point travel time curves will not be plotted), the calculated travel times if itx=2, or the observed travel times if idata<0 (default: 0.5) velht - the maximum height of the velocity values (mm) when ivel=1 or -1 is equal to velht*albht (default: 0.7) nskip - the first nskip points (step lengths) of all ray paths are not plotted (default: 0) nrskip - plot every nrskip ray traced (default: 1) npskip - plot every npskip point of each ray traced (default: 1) vred - reducing velocity (km/s) of travel time-distance plot; observed data in the file tx.in is assumed to be unreduced (a value of zero is permitted for no reduction; vred must be less than 10) (default: 8) xwndow, ywndow - the horizontal and vertical size of the graphics window (mm) that will over-ride a window size specified in an "mx11.opt" or ".Xdefaults" file; the maximum allowable values (to use the entire screen) are 350 and 265 mm, respectively (defaults: if xwndow or ywndow is less than or equal to zero, the size of the window specified in the "mx11.opt" or ".Xdefaults" file is used) Note: the effect of these parameters will depend on the local graphics system and machine type dvmax, dsmax - a warning message is written to the screen and the to file r1.out indicating the layers in which the magnitude of the velocity gradient vector is greater than dvmax (km/s/km) and the layer boundaries having a change in slope across three successive points of greater than dsmax (degrees) (defaults: infinite, infinite) ibcol, ifcol - background and foreground colours (defaults: 0, 1) mcol - an array specifying the colours of the model: the layer boundaries are mcol(1), the vertical boundaries are mcol(2), the floating reflectors are mcol(3), the smooth layer boundaries are mcol(4), and the velocity values are mcol(5) (default: 1, 1, 1, 1, 1) ircol - colour the ray paths according to the value of ivray for that particular ray group (1), according to the shot number (2), or according to the ray group (3) (default: 0) itcol - colour the observed travel times according to the integer code identifying each pick in the file tx.in (the 4th column) (1), or according to the shot number (2); if itcol=3, the observed travel times are coloured as if itcol=1 and the calculated travel times are coloured according to ray group (invr=1 must be used) (default: 0) title - title for plot (up to 80 characters long) positioned using xtitle and ytitle (default: none) xtitle, ytitle - x and y position (mm) of the plot title (default: 0, 0) colour - an array specifying the colours of the ray paths if ircol>0 and the observed travel times if itcol>0 (default: 2,3,4,5,6,8,17,27,22,7)

Sat Mar 7 19:13:54 EST 1998