function range_logx,minx,maxx,numx

;---------------------------------------------------------------
;  Generate a range of numbers at logarithmic intervals.
;
;  input:
;    minx....starting value
;    maxx....ending value
;    numx....# of numbers
;
;  output:
;    x.......array of numbers, fltarr(numx)
;
; Source: Mark Hervig, GATS Inc.
;---------------------------------------------------------------

   exp_minx = alog10(minx)
   exp_maxx = alog10(maxx)
   num_dec  = exp_maxx - exp_minx

   x = 10.0^( exp_minx + num_dec * ( findgen(numx)) /(numx-1 ))

   return,x
   
   end