diff --git a/misc/example-data/bergstrom2019/bergstrom2019.xlsx b/misc/example-data/bergstrom2019/bergstrom2019.xlsx
new file mode 100644
index 000000000..bb134e2dd
Binary files /dev/null and b/misc/example-data/bergstrom2019/bergstrom2019.xlsx differ
diff --git a/misc/sandbox/evolve.R b/misc/sandbox/evolve.R
index 7be98877e..0dd026eee 100644
--- a/misc/sandbox/evolve.R
+++ b/misc/sandbox/evolve.R
@@ -105,9 +105,12 @@ o <- fetchOSD(c('musick'))
 e <- evolve(o, iter = 75, loss.limits = c(1, 3))
 
 par(mar = c(0, 0, 0, 0))
-plotSPC(e, plot.depth.axis = FALSE, name.style = 'center-center', print.id = FALSE, width = 0.45)
+plotSPC(e, depth.axis = FALSE, name.style = 'center-center', print.id = FALSE, width = 0.45)
 abline(h = 0)
 
+par(mar = c(0, 0, 0, 0))
+plotSPC(e, depth.axis = FALSE, name = NA, print.id = FALSE, width = 0.45, lwd = 0.33)
+abline(h = 0, lwd = 1, lty = 2)
 
 
 # plotSPC(z, plot.depth.axis = FALSE, name.style = 'center-center', print.id = FALSE, width = 0.45)
diff --git a/misc/sandbox/warp.R b/misc/sandbox/warp.R
new file mode 100644
index 000000000..68550d5cc
--- /dev/null
+++ b/misc/sandbox/warp.R
@@ -0,0 +1,102 @@
+library(aqp)
+library(soilDB)
+
+
+# https://www.fao.org/3/cb0509en/CB0509EN.pdf
+
+
+#' @title Inflate/Deflate Horizon Thickness
+#'
+#' @param x a `SoilProfileCollection` object
+#' @param fact numeric or character; warping factor specified as a single numeric value, vector of numeric values (length = nrow(x)), or column name of a horizon level attribute containing numeric values
+#' @param updateProfileID logical; modifiy profile IDs
+#' @param suffix character; suffix added to profile IDs when `updateProfileID = TRUE`
+#'
+#' @return a modified version of `x`, `SoilProfileCollection` object
+#' @export
+#'
+#'
+warp <- function(x, fact, updateProfileID = TRUE, suffix = '-w') {
+  
+  ## TODO: vectorize over profiles, and make more efficient
+
+  # parts
+  .h <- horizons(x)
+  .htb <- horizonDepths(x)
+  .n <- nrow(.h)
+  
+  # sanity check: fact should be length:
+  # * 1, used by all horizons
+  # * nrow(x), each horizon has its own factor
+  # * column name
+  
+  if(inherits(fact, 'character')) {
+    fact <- x[[fact]]
+    if(is.null(fact)) {
+      stop('fact must name a column in horizons')
+    }
+  } else if(inherits(fact, 'numeric')) {
+    
+    if(length(fact) > 1 && length(fact) != .n) {
+      stop('fact must be length 1 or nrow(x)')
+    }
+    
+  } else {
+    stop('fact must be either character vector or numeric')
+  }
+  
+  # hz thickness
+  .thick <- .h[[.htb[2]]] - .h[[.htb[1]]]
+  
+  # apply inflation/deflation factor to horizon thickness
+  # round to integers
+  .thick <- round(.thick * fact)
+  
+  # generate new horizon depth sequence
+  # starting from original topmost depth
+  .start <- .h[1,  .htb[1]]
+  
+  # tops / bottoms
+  .tops <- c(.start, cumsum(.thick[-.n]))
+  .bottoms <- c(cumsum(.thick))
+  
+  # replace original values
+  .h[[.htb[1]]] <- .tops
+  .h[[.htb[2]]] <- .bottoms
+  
+  # re-pack horizons
+  replaceHorizons(x) <- .h
+  
+  # optionally update profile ID
+  if(updateProfileID) {
+    .pID <- profile_id(x)
+    profile_id(x) <- sprintf("%s%s", .pID, suffix)
+  }
+  
+  return(x)
+}
+
+
+o <- fetchOSD('zook')
+oo <- warp(o, fact = c(1.8, 1.3, 0.6, 0.75, 0.8, 1, 1, 1))
+x <- combine(o, oo)
+
+.y1 <- x[1, , .TOP]
+.y2 <- x[2, , .TOP]
+
+par(mar = c(1, 0, 0 , 2))
+plotSPC(x, name.style = 'center-center', cex.names = 0.8, width = 0.2, max.depth = 200)
+arrows(x0 = 1 + 0.2, y0 = .y1, x1 = 2 - 0.2, y1 = .y2, len = 0.1, col = 2)
+
+
+
+o$fact <- c(1, 1, 1, 1, 1, 1, 1, 1)
+oo$fact <- c(1.8, 1.3, 0.6, 0.75, 0.8, 1, 1, 1)
+x <- combine(o, oo)
+
+par(mar = c(1, 0, 3 , 2))
+plotSPC(x, name.style = 'center-center', cex.names = 0.8, width = 0.2, max.depth = 200, depth.axis = FALSE, hz.depths = TRUE, color = 'fact')
+arrows(x0 = 1 + 0.2, y0 = .y1, x1 = 2 - 0.2, y1 = .y2, len = 0.1, col = 'grey')
+
+
+