as far as I understand, and it looks like that gnuplot does not allow

other than screen coordinates for offset in the multiplot environment.

Probably it's not clear which coordinates it should take: the first

ones, the previous ones...?

Anyway, you could use the gnuplot internal variables GPVAL_...

"show var GPVAL"

With this you need to do some "little" coordinate transformations.

Maybe there is even a more elegant solution?

The following code should do what you're looking for...

You can actually skip all the lines starting with "print..."

### start gnuplot example code

reset

# enter the coordinates of the origin of the second plot

# i.e. coordinates with respect to the first plot

XPos = -10

YPos = 0

set multiplot

# your first plot

plot x

print "TermSize x,y: ", GPVAL_TERM_XSIZE, ", ", GPVAL_TERM_YSIZE

print "Term X: ", GPVAL_TERM_XMIN, " to ", GPVAL_TERM_XMAX

print "Term Y: ", GPVAL_TERM_YMIN, " to ", GPVAL_TERM_YMAX

print "Graph X: ", GPVAL_X_MIN, " to ", GPVAL_X_MAX

print "Graph Y: ", GPVAL_Y_MIN, " to ", GPVAL_Y_MAX

XScaling = (GPVAL_TERM_XMAX - GPVAL_TERM_XMIN)/(GPVAL_X_MAX - GPVAL_X_MIN)

YScaling = (GPVAL_TERM_YMAX - GPVAL_TERM_YMIN)/(GPVAL_Y_MAX - GPVAL_Y_MIN)

print "Scaling x,y: ", XScaling, YScaling

XMargin = GPVAL_TERM_XMIN/XScaling

YMargin = GPVAL_TERM_YMIN/YScaling

print "Margin x,y: ", XMargin, YMargin

XOffset = (XPos - GPVAL_X_MIN + XMargin)*XScaling/GPVAL_TERM_XSIZE

YOffset = (YPos - GPVAL_Y_MIN + YMargin)*YScaling/GPVAL_TERM_YSIZE

print "XOffset x,y: ", XOffset, YOffset

# your second plot, for example with reduced size

set size 0.4

set origin XOffset,YOffset

plot x*x

unset multiplot

### end gnuplot code

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