Multiple Edges

The multiedge command removes a secondary edge-like contribution from a data column by building a model function and subtracting it.

In practice, multiedge:

  1. computes a compensation curve from the selected edge function
  2. stores it as a new column called edge_<kind>
  3. updates the target column by subtracting that curve

Basic Usage 

multiedge <kind> <a> <b> <c> [options]

where:

  • <kind> selects the edge function
  • <a> is the function amplitude
  • <b> is the edge position (number with unit)
  • <c> controls width/shape (number with unit)

Command Options

Option Description
--axis <axis>
-x <axis>		 Axis used to evaluate the function. If omitted, inferred from units of b and c.
--column <col>
-c <col>		 Data column to correct (default: a).
--reparam
-r		 Disable reparameterized scaling and use native function scaling.

Edge Function Types

The following function kinds are available:

Kind Description Accepted aliases
atan Arctangent step-like model arctangent, cauchy, lorentzian
tanh Hyperbolic-tangent (logistic-like) model hyperbolictangent, logistic, sigmoid
erf Error-function step model errorfunction, normal, gaussian
exp One-sided exponential model exponential, onesidedexponential
lin Linear ramp model linear, ramp, triangle, triangular, sawtooth

Notes:

  • Function names are matched fuzzily (minimum 3 characters).
  • b and c accept eV or k units, depending on the axis used for evaluation.

Examples 

# Arctangent compensation on default column 'a'
multiedge atan 0.25 8400eV 50eV

# Exponential compensation using k-axis units
multiedge exp 0.12 7.5k 0.8k

# Correct a different data column
multiedge erf 0.18 8350eV 35eV --column mu

# Linear ramp with explicit axis
multiedge lin 0.10 6.0k 1.2k --axis k

Results

For each processed page in the reciprocal domain, the command:

  • creates edge_<kind> with the computed compensation curve
  • subtracts this curve from the selected target column

This removes the modeled multiple-edge contribution while keeping the correction curve available for inspection.

See also: