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              [[[https://codepen.io/thebabydino/pen/zEbVPO]]]

svg(viewBox=[-d, -.5*d, 2*d, hf*d].join(' ') 
		xmlns='http://www.w3.org/2000/svg')
	style
		| * {
		| 	fill: #{darken};
		| 	font: #{fs}px consolas, monaco, monospace
		| }
		| svg > [d], [r] {
		| 	fill: none;
		| 	stroke: #{darken};
		| 	stroke-linecap: round;
		| 	stroke-width: #{2*sw}
		| }
		| [x] + [d] { marker-end: url(#e) }
		| [d] + [x] { font: italic 1em times new roman, serif }
		| [r='#{hr}'] { stroke: #{llight} }
		| [r] + [d] { stroke: #95a; stroke-width: #{4*sw} }
		| [d] + [d] { stroke: #{orange}; stroke-width: #{3*sw} }
		| [d] + [d] ~ * { fill: #{orange} }
	marker#e(markerWidth=ad markerHeight=ad 
						viewBox='0 -4 8 8' 
						orient='auto' refX='7')
		path(d='M8 0 0-4V4')
	//-radius text
	text(x=-.5*(hrd + fs) y=-(.5*hrd + .2*fs)) R
	text(x=.5*(hrd - .2*fs) y=-(.5*hrd + .2*fs)) R
	text(x=.5*(-3*hrd - fs) y=(.5*hrd - .2*fs)) R
	text(x=.5*(3*hrd - .2*fs) y=(.5*hrd - .2*fs)) R
	//-axes
	path(d=`M${-ax} 0H${ax}`)
	text(x=ax - .5*fs y=-.5*fs) x
	path(d=`M0${-ax}V${hf*ax}`)
	text(x=.4*fs y=(hf*ax - .2*fs)) y
	//-helper circles
	circle(cx=-hrd r=hr)
	circle(cx=hrd r=hr)
	//-radius lines
	path(d=`M${-2*hrd - ram} ${hrd - ram}l${ram} ${-ram} ${ram} ${ram}
					M${-2*hrd} ${hrd} 0${-hrd} ${2*hrd} ${hrd}
					M${-2*hrd} ${hrd - ram}h1
					M${2*hrd + ram} ${hrd - ram}l${-ram} ${-ram} ${-ram} ${ram}
					M${2*hrd} ${hrd - ram}h1`)
	//-tangent lines
	path(d=`M${-2.5*hrd} ${.5*hrd} 0 ${3*hrd} ${2.5*hrd} ${.5*hrd}`)
	//-highlighted points
	circle(cx=-hrd r=pr2)
	circle(cx=hrd r=pr2)
	circle(cy=-hrd r=pr)
	circle(cy=3*hrd r=pr1)
	circle(cx=-2*hrd cy=hrd r=pr)
	circle(cx=2*hrd cy=hrd r=pr)

// minimal SVG
<svg viewBox='-2500 -1250 5000 3125' xmlns='http://www.w3.org/2000/svg'><style>*{fill:#333;font:150px consolas,monaco,monospace}svg>[d],[r]{fill:none;stroke:#333;stroke-linecap:round;stroke-width:10}[x]+[d]{marker-end:url(#e)}[d]+[x]{font:italic 1em times new roman,serif}[r='625']{stroke:#ccc}[r]+[d]{stroke:#95a;stroke-width:20}[d]+[d]{stroke:#f90;stroke-width:15}[d]+[d]~*{fill:#f90}</style><marker id='e' markerWidth='10' markerHeight='10' viewBox='0 -4 8 8' orient='auto' refX='7'><path d='M8 0 0-4V4'/></marker><text x='-296' y='-251'>R</text><text x='206' y='-251'>R</text><text x='-738' y='191'>R</text><text x='648' y='191'>R</text><path d='M-1230 0H1230'/><text x='1155' y='-75'>x</text><path d='M0-1230V1538'/><text x='60' y='1508'>y</text><circle cx='-442' r='625'/><circle cx='442' r='625'/><path d='M-964 362l80-80 80 80M-884 442 0-442 884 442M-884 362h1M964 362l-80-80-80 80M884 362h1'/><path d='M-1105 221 0 1326 1105 221'/><circle cx='-442' r='13'/><circle cx='442' r='13'/><circle cy='-442' r='25'/><circle cy='1326' r='18'/><circle cx='-884' cy='442' r='25'/><circle cx='884' cy='442' r='25'/></svg>
            
          
!
            
              body {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	margin: 0;
	height: 100vh;
}

svg { display: block }
            
          
!
            
              // minimal SVG: https://codepen.io/thebabydino/pen/Oxrqaq?editors=1000
            
          
!
999px
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