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isis:slxfig:anstrom_to_kev

# Angstrom to keV (and back) coordinate axis transformation

The important thing happens in 4 lines at the very beginning; the rest is my usage of the transformation, in case anybody needs it.

```require("isisscripts");
require("../common_pars.sl");

%% define coordinate transformation
private define aa_to_keV (val, opt){
return _A(val);
}

%%%%%

%delta angstrom
variable da = 3.125;

%variable Major = reverse([1:10]);
%variable Minor = reverse([1:100]*0.1);

variable Major = [9,8,7,6,5,4,3,2.5,2,1.8,1.6,1.4,1.2,1.1,1,0.9];
variable Minor = [reverse([16:100]*0.1),reverse([8*4:16*4]/40.)];

variable pl1 = xfig_plot_new(width*2,height*(2./3));
pl1.world(1.3,1.7+da,-0.001,0.35);
pl1.world2(_A(1.3),_A(1.7+da),-0.001,0.32);
pl1.x2axis(;wcs="aa_to_keV",major=Major,minor=Minor);
pl1.y2axis(;ticlabels=0);

pl1.hplot(ll.lo,ll.val;color=lcol,depth=1);
pl1.plot([ll.lo+ll.hi]/2,ll.val,ll.err;sym="point",color=lecol,depth=2);
pl1.hplot(hh.lo,hh.val;color=hcol,depth=1);
pl1.plot([hh.lo+hh.hi]/2,hh.val,hh.err;sym="point",color=hecol,depth=2);
[-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");

pl1.xlabel("Wavelength [\AA]"R);
pl1.ylabel("Photons cm\$^{-2}\$ s\$^{-1}\$ keV\$^{-1}\$"R);
pl1.x2label("Energy [keV]");

%pl1.render("zoom.pdf");

variable pl2 = xfig_plot_new(width*2,height*(2./3));
pl2.world(1.3+da,1.7+2*da,-0.001,0.07);
pl2.world2(_A(1.3+da),_A(1.7+2*da),0,0.32);
pl2.y2axis(;ticlabels=0);
pl2.x2axis(;wcs="aa_to_keV",major=Major,minor=Minor);

pl2.hplot(ll.lo,ll.val;color=lcol,depth=1);
pl2.plot([ll.lo+ll.hi]/2,ll.val,ll.err;sym="point",color=lecol,depth=2);
pl2.hplot(hh.lo,hh.val;color=hcol,depth=1);
pl2.plot([hh.lo+hh.hi]/2,hh.val,hh.err;sym="point",color=hecol,depth=2);
[-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");
[-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");

pl2.xlabel("Wavelength [\AA]"R);
pl2.ylabel("Photons cm\$^{-2}\$ s\$^{-1}\$ keV\$^{-1}\$"R);
pl2.x2label("Energy [keV]");

variable pl3 = xfig_plot_new(width*2,height*(2./3));
pl3.world(1.3+2*da,1.7+3*da,-0.001,0.025);
pl3.world2(_A(1.3+2*da),_A(1.7+3*da),0,0.32);
pl3.y2axis(;ticlabels=0);
pl3.x2axis(;wcs="aa_to_keV",major=Major,minor=Minor);

pl3.hplot(ll.lo,ll.val;color=lcol,depth=1);
pl3.plot([ll.lo+ll.hi]/2,ll.val,ll.err;sym="point",color=lecol,depth=2);
pl3.hplot(hh.lo,hh.val;color=hcol,depth=1);
pl3.plot([hh.lo+hh.hi]/2,hh.val,hh.err;sym="point",color=hecol,depth=2);
[-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");
[-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");

pl3.xlabel("Wavelength [\AA]"R);
pl3.ylabel("Photons cm\$^{-2}\$ s\$^{-1}\$ keV\$^{-1}\$"R);
pl3.x2label("Energy [keV]");

variable pl4 = xfig_plot_new(width*2,height*(2./3));
pl4.world(1.3+3*da,1.7+4*da,-0.001,0.01);
pl4.world2(_A(1.3+3*da),_A(1.7+4*da),0,0.32);
pl4.y2axis(;ticlabels=0);
pl4.x2axis(;wcs="aa_to_keV",major=Major,minor=Minor);

pl4.hplot(ll.lo,ll.val;color=lcol,depth=1);
pl4.plot([ll.lo+ll.hi]/2,ll.val,ll.err;sym="point",color=lecol,depth=2);
pl4.hplot(hh.lo,hh.val;color=hcol,depth=1);
pl4.plot([hh.lo+hh.hi]/2,hh.val,hh.err;sym="point",color=hecol,depth=2);
[-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");
%		 [-0.001,-0.001,0.35,0.35];color="silver",fillcolor="silver");

pl4.xlabel("Wavelength [\AA]"R);
pl4.ylabel("Photons cm\$^{-2}\$ s\$^{-1}\$ keV\$^{-1}\$"R);
pl4.x2label("Energy [keV]");

xfig_new_vbox_compound(pl1,pl2,pl3,pl4,1).render("zoom.pdf");

print("STACK:");
_print_stack;
exit;```